Factor 1 Base

These base layers are manufactured using patterns based on the Meraklon range. They should be worn snugly but not restrictive. Unisex leggings (no Fly) are only produced currently in this range.

Chest Inches 28-31 32-34 35-37 38-40 41-42 43-45
Chest CM 71-79 81-87 89-94 97-102 104-107 109-114
Back drop inches 24 26 28 30 32 33
Back drop cm 61 66 71 76 81 84
waist inches 26-28 29-31 32-34 35-37 38-40 41-42
waist cm 66-71 74-79 81-87 89-94 97-102 104-107
inside leg inches 24 27 28 29 30 31
inside leg cm 61 66 71 76 81 84
womens uk 6 8-10 12 14 16 18
womens european 34 36-38 40 42 44 46

Sub Zero Factor 1 Zip Turtle Unisex Base Layers


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Sub Zero Factor 1 Zip Turtle Unisex Base Layers are manufactured from tubular 100% polyamide fabric that eliminates the need for side seams on standard base layer sizes. If you require petite thermal underwear for women (XS) or plus size thermal underwear (XXL+) then the fabric has to be opened out and cut from different patterns. This means that flat side seams will be present. All of our Factor 1 base layer tops have extra generous body lengths giving you a decent amount of fabric to tuck in to your trousers. This prevents lower back exposure when you bend over to tie your shoe laces or look for something in your backpack.

The shoulders are closed using flat seam stitching which eliminates chaffing when wearing a rucksack. The sleeves are constructed so they are set-in to the body of the base layer, providing a much better fit and maximising insulation and moisture transportation (wicking). The cuff on the sleeves is double thickness to provide extra protection for the wrist and to help prevent the loss of trapped warm air. The stand-up double thickness turtle neck features a 18cm / 7inch long YKK zip that finishes just under the chin.

Sub Zero Factor 1 unisex zip turtle tops are ideal base layers, suitable for all outdoor sports where extra neck protection is required. They also have the added bonus of the wearer being able to vent themselves should they overheat. These lightweight next to the skin base layers are ideal for skiing, cycling and hiking, and can be used in combination with the Sub Zero Factor 2 thermal mid layer underwear range for extra warmth in extreme conditions.


Made in: England

Sun Protection Factor: 50+

TOG: 0.42

Fabric: 100% Polyamide

Average weight: 175g / 6oz

Fit: Unisex snug

Layer: First - next to the skin

Size availability: XSmall-XXLarge

Colour: Black, Cobalt Blue

Fabric treatments: Hydrophilic impregnated

Washing instructions: 40°C wash with mild detergent, do not tumble dry, iron on low setting



1 Reviews






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Sep 10, 2019

The very best

The very best thermals on the market. Extremely comfortable and dry from soaking wet to bone dry overnight hanging up inside the tent. Subzero thermals are without question my most important part of winter camping. There is nothing worse than being cold. I have used subzero thermals for over 30 years and consider them to be the very best


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