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Size Charts - Boys' Calvin Klein Underwear

Size Waist Weight
X-Small (4-5) 20-21 in. (51-53 cm) 33-42 lbs. (15-19 kg)
Small (6-7) 22-23 in. (54-58 cm) 43-58 lbs. (19-26 kg)
Medium (8-10) 24-25 in. (61-64 cm) 59-73 lbs. (27-33 kg)
Large (12-14) 26-27 in. (65-69 cm) 74-100 lbs. (34-45 kg)
X-Large (16-18) 28-30 in. (71-74 cm) 101-126 lbs. (46-57 kg)