All Four Paws 8-Inch Chill Pet Collar, X-Large 8" Neck Diameter Made with non-rigid silicone that won't lose its shape. Keeps your dog cool for up to 2 hours Unique hidden buckle keeps the collar fastened and comfortable. Easy to wipe clean. Ideal for playing at the park, going for a walk or relaxing at home. 8-inch Neck Diameter The Chill collar is made with silicon and will never loose it's shape Whether on a walk, playing at the park, or chilling at home, the Chill Collar keeps your dog cool for as long as 2 hours Unique hidden buckle easily keeps the collar fastened Easy to wipe clean