Help keep your arm muscles warm and activated with the McDavid Adults' uCool™ Compression Arm Sleeves, which are made of 80% nylon and 20% spandex fabric with 6-thread, flatlock technology for strength at the seams. Featuring hDc™ Moisture Management Technology to help keep you cool and dry, these sleeves have Active Cooling Technology and an enhanced evaporative cooling effect that may keep your skin up to 5°F cooler. 50+ UV skin protection.