3M Cover 12 X 27 cm - 100 Count CaseAbout 3M Protective Cover, 4 3 4 x 10 1 2 Inch (100 Units) This 3M Cover for Nexcare Reusable Cold Hot Pack is a cover intended for use with the Nexcare Reusable Cold Hot Pack 2641 3M's cover forms a layer between the skin and the gel pack for added protection The 4 3 4 x 10 1 2 inch sleeve provides enough room to fit 3M reusable gel packs It increases comfort without interfering with the healing process It reduces the likelihood of cold or heat burns