Columbia Quarter Zip Under Layer Size says Medium but it’s meant to be worn close to your skin. It could easily fit a small size person as well. It has A lot of stretch since it is 15% spandex. It works like a “long john” style top but with a quarter zip. I am selling because I am downsizing in retirement and have just too many ski style tops. You can also wear this for running or an under-layer for any outdoor activity. Thumb holes on each arm. Last photo shows Omni Heat shirt turned inside out so that you can see the lining. This OMNI HEAT lining is throughout the body and arms of the shirt. It is a very soft material inside and outside. 85% polyester 15% spandex (Elastane) Color is an amazing and rich sky blue. This shirt is in very good used condition. 5⭐️⭐️⭐️⭐️⭐️ seller Fast shipment New to Poshmark?? Use my referral code when signing up to get $10 off your first order from ANY closet. Code: CHACHALOOT