TO KEEP YOU COOL WHEN THE HEAT TURNS UP! Sanctuary tested. A must for those who must work outside regardless how high the temps.These headbands are designed to cool important pulse points. Plenty of 100% cotton fabric to ensure a secure tie. Cooling crystals encased within headband. Simply hydrate with cool water. Miracool crystals work in combination with the evaporative process when worn against head cooling sensations are passed to pulse points and carried through out the body.