Abstract: A waterproof material of a circular knitted fabric woven from a first yarn and a second yarn. The first yarn is a nylon filament containing ultra-micro silver ions and the second yarn is a polyester yarn. The fabric is made of approximately 20 to 40% of the first yarn and 60-80% of the second yarn. An antibacterial waterproof sheet has a multilayer construction for controlling bacterial growth, eliminating odor and resisting wear and includes a polyurethane film having an upper and lower side forming an innermost layer. A layer of polyurethane adhesive is disposed on each upper and lower side of the film. A layer of knitted material is disposed on each layer of adhesive forming opposed outer layers of the sheet. The knitted material is woven from the first yarn and a second yarn. The silver powder ions are 1 micron or less.