Relief Pak ColdSpot has been designed to provide even distribution of cold therapy throughout the entire pad. These WrapOn Polar Pads incorporate elastic straps that wrap around the joint and affix to the foam-backed pad. While using a WrapOn pad, you may attain additional compression to the joint by increasing tension of the straps. Three ultrasonically welded polyether/polyurethane sheets. All pads have continuous flow matrix. WrapOn Pads are compatible with the Polar Care® 500, Polar Care 300 and the Polar Care Cub only.