Discreet, warm base layer that I wore when running in sub-zero temperatures (mostly alone, with a t-shirt over it); even with 10 mph wind and sleet! The fit is as expected; At 5ft 8" with a 34" bust and 28" waist I ran small and given the compression there is some waist room but not much. I think UA offers other, uncompressed ("customized") base layers!
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