CEP Sportswear Non-Compressive SPF 50+ Arm Coolers;designed to protect the athlete from the harmful effects of the sun during endurance training and racing. CEP non-compressive Arm Coolers are perfect for all runners, triathletes, cyclists, and anyone looking to protect their arms from harmful UV rays while participating in outdoor activities. Functional Characteristics: * UPF 50+ sun protection from the high-density knit structure and UV absorbing yarn. * CEP Cool-Cell technology reacts with sweat or water to reduce skin temperature by up to 6 degrees, keeping your skin temperature low and reducing fatigue. Benefits: * UPF 50+ sun protection * Hyper-dry wicking fabric * Cool-cell moisture activated * Skin cooling technology * Comfortable elastic bicep cuff Material: * 90% Polyester * 10% Lycra Size Arm Length Small Medium Large Up to 16" 16.5" - 18.5" 19" +