A mattress protector includes a composite sheet having a non-deformed length and a non-deformed width. The composite sheet includes a fabric and a water impermeable polymer. The composite sheet is capable of repeatedly stretching to a deformed length of at least 115% of the non-deformed length and returning to within 8% of the non-deformed length without rupture or permanent wrinkling of the composite sheet. Mattresses may be covered and protected by such a mattress protector. Methods of forming mattress protectors include providing a water impermeable polymer on a fabric so as to form a composite sheet having a non-deformed length and a non-deformed width, and formulating and configuring the composite sheet so as to be capable of repeatedly stretching to a deformed length of at least 115% of the non-deformed length and returning to within 8% of the non-deformed length without rupture or permanent wrinkling of the composite sheet.一種床墊保護罩，包括複合片材，具有非變形長度和非變形寬度， 所述複合片材包含織物和經所述織物攜帶的不透水聚合物。複合片材反復拉伸到至少所述非變形長度的115%的變形長度，並返回到所述非變形長度的8%以內，且所述複合片材無破裂或永久性皺紋。床墊可通過該床墊保護罩被遮蓋及保護。用於形成床墊保護罩的方法包括在織物上提供不透水聚合物，形成具有非變形長度和非變形寬的複合片材，且所述複合片材被配製及成形以便反復拉伸到至少所述非變形長度的115%的變形長度，並返回到所述非變形長度的8%以內，且所述複合片材無破裂或永久性皺紋。
