The Patagonia Baby QT Swimsuit is a one-piece swimsuit made of a stretchy nylon/Spandex blend with 50+ UPF sun protection and a stay-put fit.Features:Stretchy nylon/Spandex blend has a stay-put fit with 50+ UPF sun protection Ruffle detail at neckline Contrast trim around neck, straps and leg opening made of an 83% recycled nylon/17% Spandex blend Wide cross-back straps with keyhole opening in back Fabric:Prints: 82% nylon/18% SpandexSolid trim: 83% recycled nylon/17% Spandex See "Overview" below for sizing information