... 3.Patent No.: ZL2007203106592 4.Portable,folding,warm hot tub FDB hot tub, aims at meeting apartment dwellers, moving, travel, ... for customers. Save space and waterPortable, folding, heat insulation, removable, detachableWear-resisting, pressure-resisting and long-lasting ... steel frame; Eco-friendly waterproof fabric (Nonplastic); Insulation layer Net weight/ Gross weight7KG/9KGSuitable Temperature-30- ...