Surgipack Keep Dry Waterproof Arm Protector, Full Arm. Reusable, latex free, adjustable fit. Directions / Dosage The Keep Dry Waterproof Arm Protector has been manufactured using a patented OSFA (One Size Fits All) design. Using the detailed instructions inside the pack, cut to the required size and insert the injured limb. To guarantee watertight coverage, ensure the Waterproof Arm Pr otector is pulled above the injured area. Indications The Keep Dry Waterproof Arm Protector is a convenient way of protecting casts and bandages against water exposure whilst showering or taking part in light water activity. Warnings Plastic is slippery when wet. Be careful around wet surfaces. Plastic can cause suffocation. Keep out of reach of children unless under adult supervision.