The product description 1. A cooling handkerchief is a great way to protect your dog from heat stroke. As long as the handkerchief is immersed in water the special material inside will work. 2. Place in water twirl and refrigerate for 10 minutes before removing. Bandanas have an even greater cooling effect on dogs. 3. This cooling collar is made of cold-sensing fabric which can heat and cool down. Safe irritation-free keep your dog cool for hours. 4. Keep your pet cool. Don t hesitate to indulge your pet with this cool puppy bandana.