Our patent pending Hot & Cold Pet Bed provides both cooling relief to an over-heated pet, or soothing warmth to a chilled, or arthritic pet. The reusable Hot & Cold Pet Therapy Gel Pack(s) can be cooled in the freezer or warmed in the microwave. Simply slide the Pet Therapy Gel Pack(s) into the reinforced chew resistant and scratch resistant pockets to provide your pet the desired temperature relief they require. If no therapy is required, leave the gel packs in place, and turn the bed over to provide your pet a relaxing multi-layered pillow top comfort. Each pet bed is constructed using a tough denier Cordura Nylon outer fabric. Each of the rounded corners and pockets of the bed is protected utilizing a 40 ounce truck tarp material creating the ultimate chew and scratch resistant pet bed. The included non-toxic, therapeutic gel pack fits inside the bed's insulated insert to warm or cool your pet for an extended period of time. Pet Therapy Gel is latex free, non-toxic, non-hazardous, microwave and freezer safe and remains pliable when frozen. Heating and freezing instructions are on each gel pack. Simply freeze or microwave the included gel pack to achieve the perfect therapeutic temperature your pet requires. Made from chew- and scratch-resistant heavy denier Cordura fabric, the Caldera Hot and Cold Pet Bed stands up to rambunctious pets and frequent use to keep your pet comfy season after season. Gel pockets and rounded corners reinforced with 40-oz truck tarp material also withstand wear and tear. 18” x 24” pet bed with one FREE reusable Hot & Cold Pet Therapy Gel Packs (included gel pack has a retail value of $11.99).