Grey Skull Sleeve for Bikers with UV Rays Protection. Grey Skull Arm Sleeve for Bikers keeps your arms protected from harmful UV rays. This cooling arm sleeve blocks UV-R, UV-A, and UV-B rays by 99.8%! Special moisture-radiating material keeps you cool in hot weather without needing movement for circulation. Add water for an even stronger cooling effect in extreme heat! Cleaning Instructions: Hand Wash Cold Do Not Bleach Do Not Iron Hang Dry Key Features: Blocks UV-R, UV-A, and UV-B Rays by 99.8% Anti-Microbial, Moisture-Absorbent Material Stretchy Tactel® and Lycra® Blend Provides Ample Stretch Full Two Degrees Cooler Than Bare Arms! Three-Dimensional Seamless Weave Design Non-Slip Elastic Bands at Top and Bottom of Sleeves One Size: Unisex, Stretches up to 22-24\"