I first ordered this underwear in a large size (my usual shirt size) and it was too tight - I returned it and re-ordered an XL which is fit me perfectly. Aside from the size issue, the thermals themselves are great. I bought them specifically for running in cold weather and the blend of wool and moisture wicking materials is enough to keep me warm and dry during my runs. Thermal underwear is thinner but should be paired with a light jacket to keep you warm when outdoors in above freezing temperatures.
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