100% Polyester Imported PREMIUM DURABILITY: Constructed from 100% polyester fabric, these boys' swim trunks are designed to last 20x longer than traditional swim suits, with a fit that won't sag and colors that won't fade. PERFORMANCE DESIGN: A streamlined cut with a drawstring waist and compressive fabric make these boy swim shorts an elite choice for training, competing, and recreational swimming. They feature 4-way stretch technology for freedom of movement. CHLORINE AND SUN PROOF: The TYR Durafast One Boys' Swim Jammers resist damage from chlorine and are constructed with UPF 50+. They deliver long-lasting durability and protection in the water and under the sun. IDEAL FIT: These jammer-style boys' swim trunks are cut to land just above the knee, delivering optimal coverage and unrestricted range of motion. Young swimmers of every level can enjoy the perfect balance of support and mobility. SINCE 1985: Since its inception, TYR has become one of the world’s most recognizable swimming and fitness brands. TYR, Always in Front.