You will receive 10 mixed: sand, camo, fire, black. All Blubandoo cooling headwear contains non-toxic polymer cooling crystals. The crystals evolve into a gel when immersed in water. Within minutes your Neckbandoo will completely dry to the touch, yet the active gel will remain hydrated and cool the wearer due to evaporation, for several days before slowly returning to its original crystal state. No refrigeration. Reusable and hand-washable