A favorite of all the Rolling Ridge employees when the temps soar and a must if you work outside in the summer!! Blubandoo cooling headwear and accessories contain non-toxic polymer crystals that quickly expand to a gel when immersed in water. Blubandoo products quickly dry to the touch, but stay hydrated, keeping the wearer cool (due to the slow gel evaporation) for several hours, even days, before completely drying and returning to their original shape. They are reusable again and again. Simply re-soak them in water for just five minutes.