The technical fabric of the NRS Men's H2Core?? Silkweight Short-Sleeve Shirt delivers maximum sun protection, wicks excess moisture, and dries quickly. . . Fabric: 5.4 oz. 92% polyester / 8% spandex blend. Provides maximum sun protection for SUP, kayaking, rafting, and other active water sports.. Relaxed fit for casual comfort by itself or under a life jacket.. Friction-free zones under the arms ensure comfortable paddling and rowing.. Silkweight fabrics enhance the body's natural cooling process by wicking excess moisture and drying quickly for cool comfort on the water.. UPF 50+. Weight: 8 oz.. Collections: Silkweight. Collar: Crew. Fit: Relaxed fit. Machine washable. Imported.