Come and Check Our Promo Solutions.There are 3 Layers. Outside Layer made of 600D Oxford cloth. The middle layer is insulation cotton. And the inner Layer is Waterproof PEVA material. It's Leakproof & cold / hot. Perfect insulated cooler backpack for lunch, work, hiking, camping, beach, road trip, outdoors etc. 16.7"x12.2"x8.45" Pls check inventory and detailed info with us before placing your orders.