A key part of any runner's race day kit, our Airolite Arm Sleeves provide plenty of sun protection with UPF 40 pinhole mesh. Designed to stay in place from your first mile to last, these aerodynamic arm sleeves are equipped with silicone tape at the top and elastic thumbholes at the wrist. Features. Medium weight pinhole mesh. UPF 40 (ultraviolet protection factor). Silicone tape on upper arm. Elastic thumbhole. Reflective HOKA logo. RN 88276