It’s waterproof

Two water repellent front valuables pockets to keep your stuff safe and stay organized

It features a mesh top for visibility into the cube and includes a plastic loop for compact rolling and storage

As for the materials

S1iD Technology Allows MAXIMUM Performance from SWING 1

New Nike Swim Poly Core Cut Out on Back Size 24 Girl's Black 24:Black It’s waterproofThe Nike Swim Nylon Core Solids Lingerie Tank Fast Back Swimsuit is an excellent choice for competition and practice. Its feminine, yet functional design offers a streamlined fit for reduced drag and more efficient performance in the water. It's made with Nike NX material a durable, colorfast and chlorine resistant fabric. Fabric Nike NX material. 81% Nylon 19% Spandex.