This is a comfortable long-sleeved mock neck shirt made from lightweight and stretchy material. My husband bought it at a sports shop in the US and wore it while golfing. It's a cool shirt. It's a US M size. #Please consider it as a used item as there are signs of wear. - Brand: Under Armour - Size: MD/M - Material: 82% Polyester, 18% Elastane - Color: White - Design: Long-sleeved mock neck Thank you for looking.