{"title":"Men's Thermal Base Layer Tops","description":"\u003cp\u003eStay warm and comfortable in cold conditions with our range of \u003cstrong\u003emen's thermal base layer tops\u003c\/strong\u003e. Designed to be worn next to the skin, these technical thermal tops help manage moisture while providing effective insulation without unnecessary bulk. Ideal for hiking, skiing, outdoor work, travel and everyday winter wear, with options for everything from active use to extreme cold conditions.\u003c\/p\u003e","products":[{"product_id":"factor-1-plus-mens-long-sleeve-base-layer-top","title":"Factor 1 Plus Mens Long Sleeve Base Layer Top","description":"\u003cp\u003e\u003cstrong\u003eFactor 1 Plus Mens Long Sleeve Base Layer Tops\u003c\/strong\u003e offer excellent moisture management whilst still keeping you warm, making them some of the best thermals to wear next to your skin.\u003c\/p\u003e\n\u003cp\u003eManufactured from super soft 100% polyamide fabric, these base layer tops utilise body mapping technology to construct innovative seamless body forms, enabling features such as stretch rib zones for support and waffle zones for enhanced heat retention and greater perspiration control.\u003c\/p\u003e\n\u003cp\u003eThe only seams present on these base layer thermal tops are on the sleeves and the shoulders where they incorporate other design features. The set-in sleeves provide a much more tailored fit in the armpits, maximising insulation and moisture transportation (wicking), whilst the seam on the sleeve length allows the addition of a thumb hole near to the cuff. This allows the wearer to place further layers on top of the base layer without the sleeves riding up, and can also protect the palm of the hand from cold weather. The round neck has been designed so that it stretches when placed over your head and its low profile also means it is not prominent when worn under clothing. Body lengths in all our base layer and mid layer designs are long, giving the wearer a decent amount of fabric to tuck in to their trousers. This helps to avoid lower back exposure during activities and when sitting down.\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero tops are one of the best lightweight thermal underwear ranges for general outdoor use. The simple design makes them compatible with most sports where you need to keep warm and dry. They cross over in to anything from skiing through to hiking and camping, and can be used in combination with the Sub Zero \u003ca href=\"https:\/\/subzero.co.uk\/collections\/mens-mid-layers\" title=\"Sub Zero Factor 2 THermal Mid Layers For Extra Insulation\" target=\"_blank\"\u003eFactor 2 thermal mid layer\u003c\/a\u003e range for extra warmth in extreme conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note: \u003c\/strong\u003eThe grey marl, khaki, white and black versions now come with a raglan sleeve finish.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eScroll down the page for further product details, technical information, sizing, shipping and any washing instructions.\u003c\/span\u003e\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"xsmall \/ f1pkhaki","offer_id":34405174509734,"sku":"SZMF1PLSKXS","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xsmall \/ 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f1pblack","offer_id":34405175361702,"sku":"SZMF1PLSBXXL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge \/ f1pfloyellow","offer_id":34405175460006,"sku":"SZMF1PLSFLXXL","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"xxlarge \/ f1pnavy","offer_id":34405175394470,"sku":"SZMF1PLSNXXL","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"xxlarge \/ f1pred","offer_id":34405175427238,"sku":"SZMF1PLSRXXL","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"xxlarge \/ white","offer_id":34405175328934,"sku":"SZMF1PLSWXXL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge \/ grey","offer_id":44039087030499,"sku":"SZMF1PLSGMXXL","price":49.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/files\/Mens_Factor_1_Plus_Long_Sleeve_Grey_Marl.webp?v=1729005188"},{"product_id":"factor-1-plus-mens-short-sleeve-base-layer-top","title":"Factor 1 Plus Mens Short Sleeve Base Layer Top","description":"\u003cp\u003e\u003cb\u003eFactor 1 Plus Mens Short Sleeve Base Layer Tops\u003c\/b\u003e help protect your core without being restrictive on your arms.\u003c\/p\u003e\n\u003cp\u003eManufactured from super soft 100% polyamide fabric, these base layer tops utilise body mapping technology to construct innovative seamless body forms, enabling features such as stretch rib zones for support and waffle zones for enhanced heat retention and greater perspiration control. \u003c\/p\u003e\n\u003cp\u003eThe set-in sleeves provide a much more tailored fit in the armpits, maximising insulation and moisture transportation (wicking), with the integrated low profile cufff finishing just above the elbow. Body lengths in all our base layer and mid layer designs are long,  giving the wearer a decent amount of fabric to tuck in to their trousers. This helps to avoid lower back exposure during activities and when sitting down.\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero tops are one of the best lightweight thermal underwear ranges for general outdoor use. The multi-functional design makes them compatible with most active sports where you need excellent moisture management in cooler weather. They cross over in to anything from cycling through to mountain marathons, and can be used in combination with the Sub Zero \u003ca href=\"https:\/\/subzero.co.uk\/collections\/mens-mid-layers\" title=\"Sub Zero Factor 2 thermal mid layer insulating clothing range\" target=\"_blank\"\u003eFactor 2 thermal mid layer \u003c\/a\u003erange for extra warmth in extreme conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eScroll down the page for further product details, technical information, sizing, shipping and any washing instructions.\u003c\/span\u003e\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"xsmall \/ white","offer_id":34417810145446,"sku":"SZMF1PSSWXS","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"xsmall \/ black","offer_id":34417810178214,"sku":"SZMF1PSSBXS","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xsmall \/ navy","offer_id":34417810210982,"sku":"SZMF1PSSNXS","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"small \/ white","offer_id":34417810342054,"sku":"SZMF1PSSWS","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"small \/ black","offer_id":34417810374822,"sku":"SZMF1PSSBS","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"small \/ navy","offer_id":34417810407590,"sku":"SZMF1PSSNS","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ white","offer_id":34417810538662,"sku":"SZMF1PSSWM","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ black","offer_id":34417810571430,"sku":"SZMF1PSSBM","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ navy","offer_id":34417810604198,"sku":"SZMF1PSSNM","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ white","offer_id":34417810735270,"sku":"SZMF1PSSWL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ black","offer_id":34417810768038,"sku":"SZMF1PSSBL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ navy","offer_id":34417810800806,"sku":"SZMF1PSSNL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge \/ white","offer_id":34417810931878,"sku":"SZMF1PSSWXL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge \/ black","offer_id":34417810964646,"sku":"SZMF1PSSBXL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge \/ navy","offer_id":34417810997414,"sku":"SZMF1PSSNXL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge \/ white","offer_id":34417811128486,"sku":"SZMF1PSSWXXL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge \/ black","offer_id":34417811161254,"sku":"SZMF1PSSBXXL","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge \/ navy","offer_id":34417811194022,"sku":"SZMF1PSSNXXL","price":44.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/files\/Factor--1-Plus-Mens-Short-Sleeve-Top-navy.webp?v=1746082589"},{"product_id":"factor-1-plus-mens-long-sleeve-zip-neck-base-layer-top","title":"Factor 1 Plus Mens Long Sleeve Zip Neck Base Layer Top","description":"\u003cp\u003e\u003cb\u003eFactor 1 Plus Mens Long Sleeve Zip Neck Base Layer Tops \u003c\/b\u003eoffer greater neck protection than standard round neck versions, as well as allowing greater aeration should you start to overheat during exercise. \u003c\/p\u003e\n\u003cp\u003eManufactured from super soft 100% polyamide fabric, these base layer tops utilise body mapping technology to construct innovative seamless body forms, enabling features such as stretch rib zones for support and waffle zones for enhanced heat retention and greater perspiration control. \u003c\/p\u003e\n\u003cp\u003e The set-in sleeves provide a much more tailored fit in the armpits, maximising insulation and moisture transportation (wicking), whilst the seam on the sleeve length allows the addition of a thumb hole near to the cuff. This allows the wearer to place further layers on top of the base layer without the sleeves riding up, and can also protect the palm of the hand from cold weather. The stand-up double thickness turtle neck features a 18cm \/ 7inch low profile lightweight zip with a double fabric chin guard. Body lengths in all our base layer and mid layer designs are long,  giving the wearer a decent amount of fabric to tuck in to their trousers. This helps to avoid lower back exposure during activities and when sitting down.\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero zip tops are one of the best lightweight thermal underwear ranges for general outdoor use. The multi-functional design makes them compatible with most sports where you need to keep warm and dry but also provide extra neck protection. They cross over in to anything from skiing through to hiking and camping, and can be used in combination with the Sub Zero \u003ca title=\"Sub Zero Factor 2 mid layer thermal underwear range to layer with base layers\" href=\"https:\/\/subzero.co.uk\/collections\/mens-mid-layers\" target=\"_blank\"\u003eFactor 2 thermal mid layer\u003c\/a\u003e range for extra warmth in extreme conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eScroll down the page for further product details, technical information, sizing, shipping and any washing instructions.\u003c\/span\u003e\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"small \/ black","offer_id":34424672944294,"sku":"SZMF1PZNLSBS","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"small \/ aqua","offer_id":34424672977062,"sku":"SZMF1PZNLSAS","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ aqua","offer_id":34424673042598,"sku":"SZMF1PZNLSAM","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ aqua","offer_id":34424673108134,"sku":"SZMF1PZNLSAL","price":54.99,"currency_code":"GBP","in_stock":false},{"title":"xlarge \/ aqua","offer_id":34424673173670,"sku":"SZMF1PZNLSAXL","price":54.99,"currency_code":"GBP","in_stock":false},{"title":"medium \/ black","offer_id":34424676614310,"sku":"SZMF1PZNLSBM","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ black","offer_id":34424677007526,"sku":"SZMF1PZNLSBL","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge \/ black","offer_id":34424677073062,"sku":"SZMF1PZNLSBXL","price":54.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/files\/Factor--1-Plus-Mens-Long-Sleeve-Zip-Neck-Top-Black.webp?v=1745913021"},{"product_id":"factor-1-plus-mens-short-sleeve-zip-neck-base-layer-top","title":"Factor 1 Plus Mens Short Sleeve Zip Neck Base Layer Top","description":"\u003cp\u003e\u003cb\u003eFactor 1 Plus Mens Short Sleeve Zip Neck Base Layer Tops \u003c\/b\u003eoffer greater neck protection than standard round neck versions, as well as allowing greater aeration should you start to overheat during exercise. \u003c\/p\u003e\n\u003cp\u003eManufactured from super soft 100% polyamide fabric, these base layer tops utilise body mapping technology to construct innovative seamless body forms, enabling features such as stretch rib zones for support and waffle zones for enhanced heat retention and greater perspiration control. \u003c\/p\u003e\n\u003cp\u003eThe set-in sleeves provide a much more tailored fit in the armpits, maximising insulation and moisture transportation (wicking), with the integrated low profile cuff finishing just above the elbow. The stand-up double thickness turtle neck features a 18cm \/ 7inch low profile lightweight zip with a double fabric chin guard. Body lengths in all our base layer and mid layer designs are long,  giving the wearer a decent amount of fabric to tuck in to their trousers. This helps to avoid lower back exposure during activities and when sitting down.\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero zip tops are one of the best lightweight thermal underwear ranges for general outdoor use. The multi-functional design makes them compatible with most active sports where you need need extra neck protection and excellent moisture management. They cross over in to anything from cycling through to mountain marathons, and can be used in combination with the Sub Zero \u003ca href=\"https:\/\/subzero.co.uk\/collections\/mens-mid-layers\" title=\"Sub Zero Factor 2 thermal mid layer underwear for extra insulation\" target=\"_blank\"\u003eFactor 2 thermal mid layer\u003c\/a\u003e range for extra warmth in extreme conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eScroll down the page for further product details, technical information, sizing, shipping and any washing instructions.\u003c\/span\u003e\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"small \/ black","offer_id":34424678580390,"sku":"SZMF1PZNSSBS","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"small \/ aqua","offer_id":34424678613158,"sku":"SZMF1PZNSSAS","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ black","offer_id":34424678645926,"sku":"SZMF1PZNSSBM","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"medium \/ aqua","offer_id":34424678678694,"sku":"SZMF1PZNSSAM","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"large \/ black","offer_id":34424678711462,"sku":"SZMF1PZNSSBL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"large \/ aqua","offer_id":34424678744230,"sku":"SZMF1PZNSSAL","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"xlarge \/ black","offer_id":34424678776998,"sku":"SZMF1PZNSSBXL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge \/ aqua","offer_id":34424678809766,"sku":"SZMF1PZNSSAXL","price":49.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/products\/Factor--1-Plus-Mens-Short-Sleeve-Zip-Neck-Top-Aqua.jpg?v=1590059981"},{"product_id":"factor-1-plus-mens-sleeveless-base-layer-top","title":"Factor 1 Plus Mens Sleeveless Base Layer Vest Top","description":"\u003cp\u003e\u003cb\u003eFactor 1 Plus Mens Sleeveless Base Layer Vest Tops \u003c\/b\u003eare ideal for adventurers who need to add extra bodily core insulation without bulking out the arms. \u003c\/p\u003e\n\u003cp\u003eManufactured from super soft 100% polyamide fabric, these base layer vest tops utilise body mapping technology to construct innovative seamless body forms, enabling features such as stretch rib zones for support and waffle zones for enhanced heat retention and greater perspiration control. \u003c\/p\u003e\n\u003cp\u003eKnitted in one piece, the only seams present are on the shoulders, and these are closed using a flat seam to prevent rubbing. The round neck has been designed so that it stretches when placed over your head and its low profile also means it is not prominent when worn under clothing. Body lengths in all our base layer and mid layer designs are long,  giving the wearer a decent amount of fabric to tuck in to their trousers or shorts. This helps to avoid lower back exposure during activities and when sitting down.\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero vest tops are one of the best lightweight thermal underwear ranges for general outdoor use. The simple design makes them compatible with most sports where you need to keep warm and dry. They cross over in to anything from skiing  through to hiking and camping, and can be used in combination with the Sub Zero \u003ca title=\"Sub Zero Factor 2 THermal mid layer range of insulating underwear\" href=\"https:\/\/subzero.co.uk\/collections\/mens-mid-layers\" target=\"_blank\"\u003eFactor 2 thermal mid layer\u003c\/a\u003e range for extra warmth in extreme conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eScroll down the page for further product details, technical information, sizing, shipping and any washing instructions.\u003c\/span\u003e\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"Medium \/ black","offer_id":41065567125670,"sku":"SZMF1PVBM","price":34.99,"currency_code":"GBP","in_stock":true},{"title":"Large \/ black","offer_id":41065567158438,"sku":"SZMF1PVBL","price":34.99,"currency_code":"GBP","in_stock":true},{"title":"XLarge \/ black","offer_id":41065567191206,"sku":"SZMF1PVBXL","price":34.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/files\/Sub-Zero-Factor--1-Plus-Mens-Sleeveless-Vest-Top-Black.webp?v=1724159158"},{"product_id":"factor-1-eco-mens-long-sleeve-base-layer-top","title":"Factor 1 Eco Mens Long Sleeve Base Layer Top","description":"\u003cp\u003e\u003cb\u003eFactor 1 Eco Mens Long Sleeve Base Layer Tops provide \u003c\/b\u003eexcellent insulation without the bulk that comes with wearing mid layers. \u003c\/p\u003e\n\u003cp\u003eKnitted from a blend of antibacterial bamboo, super soft merino wool, recycled polyester and stretchy elastane yarns, these base layer tops are not only kinder for the environment, but are also some of the warmest we have ever manufactured.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eNearly twice the weight of our popular Factor 1 Plus range, these base layers act like a second skin with their three way stretch. The lightly brushed inner face not only provides greater heat retention, but also a softer handle when worn next to the skin. \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ergonomic design is based on our award winning Factor 2 mid layers, with flat seams to eliminate seam rub, and contoured body panels to provide a tailored fit. The low profile round neck is constructed to stretch when placed over your head, whilst the set-in sleeves and long body lengths help to improve wicking and thermal efficiency. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThese Sub Zero Eco tops are ideal for prolonged cold weather environments and cross over in to anything from skiing through to hiking and camping.  They can be worn on their own or used in combination with the Sub Zero Factor 2 thermal mid layer range for extra warmth in extreme conditions.\u003c\/p\u003e","brand":"SUB ZERO","offers":[{"title":"xsmall","offer_id":41319617888422,"sku":"SZMF1ELSGXS","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"small","offer_id":41319618150566,"sku":"SZMF1ELSGS","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"medium","offer_id":41319618347174,"sku":"SZMF1ELSGM","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"large","offer_id":41319618543782,"sku":"SZMF1ELSGL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xlarge","offer_id":41319618740390,"sku":"SZMF1ELSGXL","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"xxlarge","offer_id":41319618969766,"sku":"SZMF1ELSGXXL","price":49.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0257\/6023\/5610\/products\/Factor-1-Eco-Mens-Long-Sleeve-Base-Layer-Top.jpg?v=1632321278"}],"url":"https:\/\/subzero.co.uk\/collections\/mens-thermal-base-layer-tops.oembed","provider":"Sub Zero","version":"1.0","type":"link"}