Ultimate Sleep King 3" 100% Natural Latex Mattress Pad Topper, Medium Firm Density Add a layer of springy comfort which is naturally hypoallergenic and anti-microbial Made from 100% pure Natural White Latex; Superior Orthopedic Support Made of pure "green" (natural) 5.3 lb density (28 - 30 IFD) latex The gain is a greater range of firmness/softness of the finished foam Each topper sports air ventilation perforation to help keep your topper fresh and dry