The Gul Evotherm Womens Thermal Rash Vest in Black is made with a Flatlock Seam Construction and an Evotherm fabric soft thermal fleece inner that is made from plush spandex fabric to keep you nice and warm whilst in the water. Other features include a water repellent outer to shield against any splashes of or rain water plus a UV Shield that offers UPF 50 sun protection. Finished off with thumb loops.