KAZ SmartTemp Portable/Reusable Hot/Cold Therapy Combo 2 pk. Stays hot or cold up to 60 minutes; Heats in the microwave/cools in the freezer; Soft washable cover with integrated elastic strap; Maintains flexibility when cold; Includes 1 small (6" x 10") and 1 large (9" x 13") pad; 1 year limited warranty.