YS up to 35 lbs, YM 35-55 lbs, YL 55-75 lbs, YXL 75-95 lbs, S 95-120 lbs, M 120-160 lbs, L 160-200 lbs, XL 200-250 lbs, 2XL 250-285 lbs Please note: Weight range is approximate. Actual fit will vary depending on body type. If you need a singlet customized for a wider body, or longer torso, please visit the custom singlet design studio to order a singlet designed to fit your body type.