Flap Happy Baby Boys' Upf 50+ Rash Guard and Infant Swim Diaper Trunk Set Top: 80% Nylon, 20% Spandex; Bottom: 100% Polyester Made in US Machine Wash Two-piece set with rash guard and swim trunks featuring built-in swim diaper Bright, fade-resistant color Swim trunks feature built-in swim diaper Lightweight UPF 50+ protection from the sun