A reusable swim diaper (10) in the form of a panty, with elastic bands (12) around the waist and/or leg openings, the diaper includes the following: a) an outer layer (14), said outer layer consisting of an elastic knitted fabric or wovens； b) an inner layer (16), said inner layer consisting of an elastic knitted fabric or wovens from natural and/or synthetic fiber materials； c) and the inner layer (16) is a water vapor-permeable and water-absorbing inner layer.
