Made from the same advanced technology as the All Season Cool K9 Vest, the Cool Collar was specifically designed to augment cooling of the neck area of the canine, or when situations are not conducive to using the cool vest. The K9 Cool Collar may be used in addition to the vest, or alone. Ideal for transport, in the car or competition trials. It also helps cool down the canine more quickly and efficiently after a workout. Never too cold, the self-regulating nature of HTF Exotherm technology ensures that it is always at the optimum temperature to reduce canine heat stress. Unique hexagonal design allows for better conformity to the dog's neck. The superlative feature of this technology is its ability to outperform ice/gel technologies by at least 5:1 with no negative biologic side effects. It can NEVER overcool your dog. This same product is also used for post-surgical rehab and healing sports injuries and is FDA registered. Very safe, eco-friendly and will last a long time.