Recommended for preventing heat stroke of your dog. Cool band to keep your dogs neck cool. The included insulated pack includes 5 pieces regardless of the size of the product. Point 1: Just cool down the included ice pack and fill it with it. This ice pack is made of water and food additives. Point 2: Designed for peace of mind to prevent cold liquids from popping out. Point 3: 4-layer construction with a cooling sheet that enhances the cooling effect. Point 4: Adopts a net fabric to reduce condensation and wetness. Point 5: The main unit is fully machine washable. Point 6: In addition to the built-in rubber, you can adjust the size with the built-in drawcord. (Size) Elastic width: Inner circumference when laid flat ~ Maximum inner circumference when wearing the product spread out with internal rubber *Ribbon type can be worn on the inner circumference; Number of pockets: (Small) Elastic width: 11.8 - 15.7 inches (30 - 40 cm); Number of pockets: 4 pieces; Size M: Elastic width: 13.8 - 18.9 inches (35 cm); Size L: 4 inches (35 inches (4 cm). 0-56cm, Number of Pockets: 6 (XL) Elastic width: 22.0 - 29.9 inches (56 - 76 cm), Number of pockets: 8 (ribbon type) Elastic width: 14.6 - 19.7 inches (37 - 50 cm), Number of pockets: 4 *The size is the actual measurement. There may be a slight deviation in the The included insulated pack includes 5 pieces regardless of the size of the product. Material: Cotton, polyester; Color: 9 types in all.