The Biomat Waterproof Cover for the Mini and Professional size is made of a high-quality lightweight woven polyester fabric. The fabric is made specifically to be sweat, water, and oil proof and to not interfere with the benefits of far infrared or negative ion treatment.
The Biomat Waterproof Cover is meant to always be used with the cotton cover which is received with the Biomat®. It may be placed on top of the cotton sheet or below it depending on the comfort and needs of the user. The important factor is that the Biomat® performance and longevity are protected during use.