The bed rug is a one-inch mat made of coconut fiber (coir) with natural latex. The bed rug is porous and allows air circulation between the bottom of a mattress and a platform bed's surface. It is strongly recommended for breathability under any foam mattress on a solid-platform bed. Where inadequate air circulation is a concern a natrual bed rug may be advisable on a slatted platform. We recommend adding two bed rugs in highly-humid environments.