
I use them for work, I'm a locksmith and sometimes I work outside in the bitter cold of winter. I have medium and large. The material is very stretchy and even if you order a size down it will probably fit after a few uses and a good wash in cold water. I've been wearing it for 6-8 hours in 10-15Β°F weather and can say it will keep you warm no matter what, actually I feel a bit sweaty if I move too much when I wear it under wearing your work clothes! The material is very thin, but as Under Armor always does, it delivers whenever you need to generate/hold body heat! This is a very good product, made from the highest quality materials (which most UA products are made of), otherwise I have a couple of UA sweatshirts with the same thermal properties and thin material. design and enjoy each of them to the fullest! 5 Stars!

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