
I use them for work, I'm a locksmith and sometimes work outside in the biting cold of winter. They are quite expensive but definitely worth their price in the end. " for all sizes I have Medium and Large. The material is very stretchy and even if you order a size smaller it will most likely fit you after a few uses and a good wash in cold water. I have it in the weather 10 worn -15Β°F for 6-8 hours and I can say it keeps you warm no matter what, I actually feel a little sweaty if I move too much while wearing it under my work clothes!very thin, but like Under Armor it holds up whenever body heat generation/retention is required!This is a very good product made from the highest quality materials (which most UA products are made of) apart from the fact that I have a number of UA- Hoodies with the same thermal properties and thin material design, enjoy each one thoroughly!5 stars!

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