Convenient to Use & Warranty Guarantee:Size 6.7" X 12", big enough to fit most, the Hot or Cold relief will slowly come back to room temperature making it Safe to Sleep when you use it.30 Days free of return, 1 year warranty, prompt and satisfying customer service. Upgrade Gel Packs: One glove has two gel packs. Compared with other microwave heating gloves, our gel pack can also be placed in the refrigerator to get cold Therapy. A single gel pack weighs 280g,which can retain heat and cold longer for extra relaxation. Cozy Material& Washable Cover:The external part of this therapy mittens are made with plush fabric for a soft and comfortable touch. Removable filler packs on each side can be removed easily, so hand therapy mitten’s cover is machine washable and durable enough to reuse. Natural Moist Heat / Cold Therapy:Warm the gel pack in microwave to get soothing moist heat. The therapy mittens distribute the heat pretty well providing full of comfort to the entire hands during hot compress and improving blood circulation. For cold therapy, freeze the gel packs in freezer,and use it for alleviate hand swelling and bruises. Fast Relief for Hand Pain & Arthritis:Mittens with 2 gel packs do well in improving flexibility of wrist, post-surgery recovery and fast relief for chronic hand pains such as hand osteoarthritis, muscle stiffness, carpal tunnel syndrome, spasms, nerve pain of hand, pain of joint deformity.