Boys' Iron Knees® Climber™ Pants are designed to handle anything and everything your little guy throws at them. That doesn't mean they're not comfortable, though. Garment washing means they're preshrunk and soft from the start. Plus, an elastic waist and built-in belt gives them a great fit every time they pull them on — no pinching, no sagging. (Tots sizes have a faux belt.) Open-bottom style.