SanSoleil's Long Sleeve active top utilizes an updated version of our original SolTek fabric. SolTek's undulating fabric pattern slightly lifts our garment from the skin for quick drying and enhanced cooling. SolTek offers enhanced moisture-wicking and athletic stretch spandex, and, most importantly, UPF 50 Protection. This long sleeve active top features raglan sleeves, and cooling mesh under the arms and around the neck to promote cooling. These garments are great for sports that require fabrics that move and are lightweight for exertion in the sun's heat. Check out SanSoleil's Newest Cooling Fabric SolTek.