Levinsohn Fresh Ideas Waterproof Mattress Protector 100% Vinyl Hypoallergenic, Twin Vinyl Waterproof mattress protector keeps mattress safe from dampness or spills. Mattress cover also protects dirt reaching mattress keeping it clean and fresh. Twin mattress protector is made with 100% vinyl, easy care just wipe clean. Made with quality materials, has fitted elastic corners and is hypoallergenic.