Simply insert the ice packs chilled in the freezer into the product's pocket and wear it! Cool down your dog's body on hot days, such as during walks. Pistachio-colored main body cover (used a few times) 2 dedicated ice packs The blue ice packs do not harden even when chilled. Also, they are ethylene glycol-free and use safe ingredients even if your pet licks them. They are non-toxic, highly viscous, and safe, so you can use them safely for your pet. Materials: Back body: 100% nylon Lining: 100% polyester Ice pack: CMC (carboxymethyl cellulose) and water Size: S size Neck circumference (actual size, measured with the product laid flat): Approximately 28-34cm Country of origin: China (planning and design: Japan)