Nuna Sena Waterproof Sheet The Nuna Sena Waterproof Sheet has been specifically made as a mattress cover for the Nuna Sena Travel Cot to protect the mattress in case your little one has an accident! This sheet is made from a breathable jersey knit fabric providing your little one with a comfortable place to sleep. Features: Suitable for use with the Nuna Sena Travel Cot Elastic band provides a perfect fit Machine washable Waterproof layer protects the mattress Breathable jersey knit fabric   Please Note: pictures are for illustration purposes only - waterproof sheet only.