Ergodyne - EGO12418 Chill-Its 6603 Evaporative Cooling Band Towel features advanced, PVA cooling technology for relief in extreme heat. When wet, it remains lightweight and comfortable for bulk-free wear around your neck. Unique, pull-through design secures the band around your neck for all-day cooling that stays put. It is rated to UPF 50 plus protection from harmful UV rays. Evaporative technologies such as PVA are a simple, effective and comfortable solution for heat stress prevention. Evaporative technologies use an external water source to draw heat away, helping regulate your body temperature while providing cool relief. When activated, this machine-washable, PVA cooling towel is comfortable and refreshing for even the hottest days of the year.