There are no standard sizes for clothing, which is why each brand has their own unique cut and fit. Please do not presume you are the same size between brands for a similar product. If you have a base layer that fits correctly, then use it as a template for these measurements.  

Chest - Measure the full circumference of your chest just below the armpits
Waist - Measure the full circumference at the top of your hips
Back Drop - Measure from the back of your neck to the base of your spine
Arm Length* - Measure from the end of your shoulder to your wrist

* This measurement is only applicable for long sleeves. Short sleeve versions of the base layer tops finish just above the elbow. 

Our base layers have a lot of stretch, so they will contour to most body shapes when worn. You should wear them close fitting but not so they are restrictive. Wearing baggy or ill fitting base layers will lead to the loss of heat and a reduction in their wicking properties.

Please be aware that these measurements are taken from the garments unstretched, apart from the 'TO FIT CHEST' column, that indicates the range of fit. The back-drop is the critical measurement. This ensures the body length is correct to prevent lower back exposure. Even if the chest measurement looks too small, the stretch of the fabric will enable a good fit.   

The table below shows the garment measurements for our Factor 1 Plus base layers. There is a tolerance of +/- 5mm.

cm in cm in cm in cm in cm in
XSMALL 71 28 71-79 28-31 79 31 63 24 61 24
SMALL 74 29.5 81-87 32-34 80 31.5 65 25 62 24.5
MEDIUM 79 31 89-94 35-37 85 33.5 67 26 63 25
LARGE 85 33.5 97-102 38-40 91 36 69 27 64 25.5
XLARGE 91 36 104-107 41-42 97 38 71 28 65 26
XXLARGE 92 36.5 109-114 43-45 98 38.5 74 29 68 27


The table below shows the actual garment weights per size for each of the different styles of Factor 1 Plus base layer tops we manufacture. There is a tolerance of +/- 10g. 

g oz g oz g oz g oz g oz
XSMALL 160 5.6 130 4.6 - - - - - -
SMALL 175 6.2 140 4.9 185 6.5 155 5.5 - -
MEDIUM 190 6.7 160 5.6 200 7.1 175 6.2 120 4.2
LARGE 210 7.4 175 6.2 220 7.8 190 6.7 135 4.8
XLARGE 230 8.1 185 6.4 240 8.5 210 7.4 150 5.3
XXLARGE 240 8.5 205 7.2 - - - - - -



Trade Customers

For over 50 years we have been supplying a wide range of industrial companies with our hard wearing clothing, helping keep their employees warm and dry in all weather conditions.

Our prices are very competitive with outstanding customer service and quick dispatch from our UK factory.

For further information and details on how to open an account with us, please see our trade customer page.


We operate a global network of distributors for our outdoor products. If you are interested in joining our team then please visit our Distributor Page for further details.

UK Retailers

The outdoor industry is very tough at the best of times for retailers. Getting the right products at the right price at the right time is a constant headache.

Here at Sub Zero we like to forge lasting relationships with our retail partners. We have products we know people want to buy and will help you reach out to them.

For further information please visit our Retailers page.


Throughout our 50+ years of trading we have supplied numerous expeditions throughout the world. Our products have been tried and tested from the ravages of Arctic/Antarctic winters to the searing temperatures of the Nevada dessert. Our experienced sales team will be able to help you with all aspects of your expedition gear list. Please contact them through the Expeditions Page.

Emergency Services & Military

We have a long history of working in partnership with UK, European and other military services around the globe. Our knowledge and experience in cold weather clothing is essential for winter deployment.

In the UK, we supply many emergency services groups with our gear, whether that be issue kit under a contract process, or direct through smaller group budgets.

Please visit our Emergency Services & Military page for further details.