Boaters love the NRS Mens H2Core; Silkweight Long-Sleeve Shirt for its maximum sun protection but the quick-dry, breathable fabric makes it a perfect ultralight base layer, too. Silkweights deliver advanced sun protection for SUP, kayaking, rafting and other active water sports.Relaxed fit for casual comfort by itself, as a base layer or under a life jacket.Friction-free zones under the arms ensure comfortable paddling and rowing.Technical fabrics enhance the bodys natural cooling process by wicking excess moisture and drying quickly for cool comfort.UPF 50+