All-Round Protection This waterproof sleeping bag liner gives ultimate, all-round protection from leaks. This liner will fit inside most standard sleeping bags, whilst featuring a side opening make it easier get into and out of. Fully Waterproof Both the top and bottom of the sheet features a waterproof layer, adding a protective layer that fully surrounds the user. This sleeping bag liner is also suitable for home or travel, providing a protective layer that can protect both the duvet and the mattress in one. Comfortable Protection This liner can also be used when camping or sleeping in wet conditions to prevent ground moisture from leaking through to the sleeper. This liner is made from 100% cotton jersey with a thin laminated waterproof polyurethane layer built inside. Machine Washable Wash separately prior to use as this will soften the fabric. Machine washable and tumble dry on low setting. After washing you may have to turn inside out and spin again due to water getting trapped inside. Do not iron, bleach or dry clean. Do not use with an electric blanket.