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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) |