Come and Check Our Promo Solutions.Made of waterproof cloth, heating material is to use the new carbonized fiber, it has a unique flexibility, rapid heating, warm and persistent. Enjoy outdoor camping and fishing even in a cold winter. There are also have a hidden switch button. Great hand warmer for men and women. The heat radiate towards the finger tips--perfect companion for every cold days use. Pls check inventory and detailed info with us before placing your orders.