Our custom mattress protector is made of an absorbent French Terry material backed with a soft, liquid repellent membrane. A great barrier against liquids, allergens, and dust mites. Ideal for boats, yachts, rvs, and more. Shaped to fit your unique mattress! Liquid proof Breathable Sleeps comfortably, will not change feel of mattress Elastic fit Ideal for boats, RVs, antique beds and more Custom shaped to fit your unique bed Sizes: Measurements need to be the longest part of the width and length of the TOP of the mattress. Standard Size: 60" width or smaller, up to 80" in length Large: 61" to 75" width, up to 80" in length Extra Large: 76" width or larger A template is required for the custom protector. Please add on the template kit if you need to make a template. Please provide us with the mattress depth. If we have any questions, we will reach out Lead times vary from 6 to 8 weeks.