jeansian Men's Slim O-Neck Stitching Long Sleeves T-Shirts Tees D346 Cotton Blend this T-Shirt is "Slim Fit " , If you want "LOOSE FIT", You may choose 1 size up USA XS(160-165cm 55kg-60kg) (5'3""-5'5"" 121-132lbs)" USA S(165-170cm 60kg-65kg) (5'5""--5'7"" 133--144lbs)" USA M(170-175cm 65kg-70kg) (5'7"-5'9" 144-155lbs) USA L(175-180cm70kg-75kg) (5'9"-5'11"155-166lbs)