Built to protect the skin against abrasion, the NRS Men's H2Core Rashguard Short Sleeve Shirt breathes freely for warm-weather comfort and provides advanced sun protection. H2Core Nylon/spandex fabric is moisture wicking and quick drying Form fitting for comfort under a life jacket or technical outerwear Friction-free zones under the arms for paddling and rowing comfort Silky exterior ensures fluid, athletic performance Brushed inner surface feels soft and cool on your skin Thread the drawstring on board shorts through the hemloop to prevent ride up NRS Rock Solid Guarantee against defects in materials and workmanship