The COOL DOG Bandana from °COOLPETS is designed to keep your pet cool in hot temperatures.   How does it work? Wet the bandana with water and wring it out. Then shake it out 2 or 3 times so that oxygen directly activates the active ingredient of °COOLPETS!   Feel the results! Format S: COOL027 (triangle): 40x30x30 cm (dog's neck circumference 30 to 36 cm) M: COOL028 (triangle): 70x45x45 cm (dog's neck circumference 38 to 46 cm). L: COOL029 (triangle): 80x60x60 cm (dog's neck circumference 44 to 52 cm)   Can be machine washed out!