ULTRA-LIGHTWEIGHT: The Premium Stretch Knit fabric is our lightest weight cooling towel, even when wet! It has a fine knit texture with no seaming for optimal comfort. The On-the-Go sizing is smaller for easier portability.COOLS INSTANTLY: When activated with water it cools to 30 degrees below average body temperature in under 30 seconds. Activate quickly in 3 steps: Wet it, Wring it out and Snap it.KEEPS COOL FOR HOURS: It stays cool for up to 2 hours so that you can comfortably stay active longer. To reactivate, just re-wet and snap.SOFT: Wet or dry it is always soft and comfortable next to the skin.CHEMICAL FREE & UPF 50: The towel is reusable and machine washable with permanent chemical-free cooling fabric technology that will never wash out. It also provides UPF 50 protection from the sun.