Your kid doesn't have decades' worth of injuries making it harder to move or making his joints pop, and the RVCA Boys' Civil Stripe Board Short is stretchy enough to keep up with his easy ability to move. There's no reason to stick him in a board short with no give that restricts every movement—he'll get enough of that from tendonitis in a few years.
Quick-drying synthetic blend with a healthy helping of spandex offers awesome flexibility for easy movement
Surf-style tie keeps these boardies securely in place