The Thermo-X vest is designed for you who want a little extra warmth on the cool days. The vest can be used under a wetsuit, but can also be used alone. It is produced in a technical heat-generating material and also comes with UPF 50+, which means maximum protection against the sun's UV rays. Ideal for surfing, kayaking, SUP, sailing and other activities on water. Comes with a combination of flactlock and strategic stitching, providing maximum comfort and flexibility. Details: - 4-way stretch - Water repellent - Integrated hood - Strategic stitching - Thermo-X Hyperdry - Flatlock stitching - Ergonomically correct stitching - 220g Nylon/Spandex