This is simply a thick felt wool page that keeps your mattress clean. Instead of vinyl or plastic, our Wool Puddle Pad is 100% pure wool to keep you warm in winter and cool in summer with no offgassing or plastic "swooshing" sound every time someone moves. The pad is big enough to fully cover a twin bed and can be easily washed. We recommend washing with Eucalan Wool Wash to preserve the wool's natural moisture-repelling lanolin. Made in Canada.