The Assos Mille GT Long Sleeve Jersey S11 is designed to adapt the ultimate hot-weather endurance jersey for the sunniest climates. Full-length sleeves provide UPF 50 protection, using a lightweight, hyper-wicking textile from the Racing Series line, while the body is made from ultra-breathable, ultra-cooling textiles that breathe like racing equipment but are cut in a streamlined RegularFit. Despite the UPF 50 protection on the sleeves, the GT body textiles offer UPF 15 and are so lightweight that sunscreen is recommended for added protection.