Our new Cool Comfort Performance Vest features performance fabric with a slight stretch for a snug fit. Features: Simple and unisex design. Zips in the front for a comfortable fit. Strategically placed cooling strips in the front and back. Color: Blue or Khaki Size: S, M, L, XL, XXL How Does It Work? Our innovative new hybrid cooling system combines the efficient cooling power of evaporation with the direct cooling of frozen water. Simply submerse in water, gently squeeze and towel dry. Allow the garment to dry to the touch and you're ready to go! The special water-absorbing crystals will soak up many times their volume in water and then hold the temperature of the water an extended period of time. Water causes a natural cooling effect as it evaporates, providing many hours of cooling relief in lower humidity. The vest or wrap may be reactivated by placing in cool water for 20 minutes or more depending on preference. For additional cooling energy, place in the refrigerator or freezer before use for up to 2 hours of cooling. Caution: Always wear a protective layer between the vest or wrap and the skin when wearing from the freezer. Please note: cooling times are estimates and will vary depending on climate, body metabolism and activity. To use the vest: Outdoor activity or work in hot conditions Multiple Sclerosis heat sensitivity Intolerance to heat (neurological or physical) Potentially reducing the risk of heat stress Polar Products Cool Comfort Performance Deluxe Sport Cooling Vest