If you log countless hours in the sun or water on the beach, a surfboard, SUP, or boat the relaxed fit and super breathable fabric of ONeills 247 Tech Crew with UPF 30 will keep you comfortable and protected.. . . . . . . Nylon and stretch spandex fabric with a water repellent finish. Lightweight, quick drying, and highly breathable protection against the elements and sun fatigue. UPF 30 protection from harmful UV rays. Provides protection from rashes and irritation caused by paddling motion, wax irritation, and sand. Board short connector allows you to lace board short laces through a small loop at the lower part of the top to keep the top in place. Durable flatlock stitched seams prevent irritation for chafe free comfort. Loose fit for maximum cooling and comfort .