... -friendly waterproof fabric,stainless steel frame 3.Small,portable,simple,warm,light,folding hot bathtub Save space and waterPortable, folding, heat ... for national patent (patent No.: ZL2007203106592).Very light,save much place and water, very suitable for mid-small room. You can ... design and insulation layer, making the heat insulation effect very well. Bathtub can keep heat insulation more than 1 ...