The Zonesleep® ‘3-D’ Spacer-Fabric Mattress Topper uses an innovative new design which combines ‘zoning’ and quality fabrics. The ‘zoned’ construction of the topper comprises of 3 layers; a layer of thick spacer-fabric for posture support and durability, a thinner middle layer of spacer-fabric for soft comfort, and a top Tencel® layer for breathability and it’s ability to dissipate moisture. Zonesleep Mattress Toppers are breathable, ultra lightweight, slim fitting, anti-allergenic and washable.