Sub Zero Factor 1 Eco Mens Long Sleeve Base Layer Thermal Tops

Factor 1 Eco Mens Long Sleeve Base Layer Top

£49.99

Size xsmall small medium large xlarge xxlarge

Pickup available at Sub Zero Warehouse

Usually ready in 24 hours

Factor 1 Eco Mens Long Sleeve Base Layer Tops provide excellent insulation without the bulk that comes with wearing mid layers.

Knitted 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.

Nearly 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.

The 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.

These 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.

Advanced thermal insulation – Retains body heat in cold conditions without bulky mid-layers.
Eco-conscious fabric blend – Made with bamboo viscose, recycled polyester, merino wool and elastane.
Antibacterial bamboo fibres – Bamboo-based fabric contributes to a comfortable base layer.
Soft brushed inner lining – Provides a soft feel against the skin and helps retain warmth.
Three-way stretch fabric – Moves with the body for enhanced flexibility and comfort.
Snug, ergonomic fit – Contoured body panels provide a close-fitting, second-skin feel.
Flat seam construction – Helps minimise rubbing and irritation during extended wear.
Moisture-wicking design – Long body length and set-in sleeves help improve moisture management.
Comfortable round neckline – Low-profile neck stretches for easy dressing and layering.
Versatile layering system – Wear alone or underneath additional thermal layers for extra warmth.
Ideal for cold-weather activities – Suitable for skiing, hiking, camping and other outdoor pursuits.
Made in Great Britain – British-made thermal clothing.

Brand: Sub Zero
SKU: SZMF1ELS
TOG: 0.59
Fabric: 44% bamboo viscose, 31% recycled polyester, 13% merino wool, 12% elastane
Average weight: 325g / 11.5oz
Fit: Snug
Layer: First - next to the skin
Size availability: XSmall-XXLarge
Colour: Grey Marl
Fabric treatments: None
Washing instructions: 30°C wash with mild detergent, do not tumble dry, iron on low setting
Made in: Great Britain

Base Layer Care

Washing instructions for Sub Zero base layers are printed on a white silk tag stitched to the back neck and can also be found knitted in to the waist band. Please follow these instructions carefully as failure to comply with them will make your guarantee void. If you have removed the tag or are unsure of the washing symbol meaning, the full washing instructions can be found below.

Machine wash or hand wash in water not exceeding 40°C or 105°F
You can use a mild washing detergent but ideally you want to use a base layer specific washing treatment
Wash dark colours separately, do not bleach, do not use fabric conditioners
These base layers can be spun dry in a washing machine
Do not tumble dry. These base layers will quickly dry on a line or airer as they retain very little water once spun/rung out.
Do not dry clean
Regular ironing may be performed at a low setting (110°C, 230°F) only, but we advise against it.

General Washing Tips

When you go to wash any garment with a zip, ensure it is done up fully otherwise the exposed teeth may cause harm in the wash cycle. The same can be said for garments containing Velcro. Your best course of action would be to wash these garments either by hand or on their own in a washing machine.

With the advancement in detergent technology, you very rarely need to wash any garments these days above 30°C. It is better to use a specific anti-bacterial wash-in treatment rather than increasing the temperature.

A lot of Sub zero products, especially the base layers and mid layers, can be ironed on a low temperature setting. We would advise against this as the heat settings on irons are not always reliable. In any case, the stretch properties of synthetics helps reduce creases in the wash and if there are any afterwards, they often drop out when worn.

Like most synthetics, Sub Zero fabrics will melt or burn if exposed to flame or direct heat. They are not flame resistant; do not use them near ANY direct source of heat or flame. This includes some of our merino wool products that contain a small percentage of synthetic yarn.

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