GH Sports Women's Aqua Thermal Top WARMTH & MOBILITY: Chest and back are made of a double-layered mesh with warm fleece lining that is wind and water-resistant. Arms are made of (after thorough testing for warmth) single-layer polyester without fleece so you can move freely in the water. -layered mesh chest and back with fleece fabric lining provides wind-resistant and water-resistant conditions CORRECT FIT: The full-length zipper should take a little effort to zip up and close. It should fit very snug to keep water from flowing under your Aqua Thermal and keep you warm during water aerobics and other water activities. Great for cold temperatures when warmth is needed. UPF 50+ and 100% polyester long-sleeve jacket is lightweight enough so that it doesn't weigh you down in the water or restrict movements, but technical enough to insulate in cold water or cold weather. MADE IN USA: Designed and manufactured in San Luis Obispo, CA where all GH Sportswear is made.