EcoDecors 31" x 18" spa solid teak floor and shower mat provides elegant functionality in our out of the shower. It has a non slip rubber track on the back to prevent the mat from shifting on the shower floor. Slats provide space for ease of water drainage through the floor. Teak is naturally water, mold, and mildew resistant due to its natural density and high oil content. It has been the wood of choice for hundreds of years of luxury boat builders.