Wolf Corporation has been making mattresses for over 135 years. Sweet Dreams Since 1873! In addition to having a long history of making comfortable and affordable mattresses, Wolf is also an innovator! This innerspring mattress comes compressed, rolled and boxed for easy shipping and easy installation. The Wolf Endura Rest Pillow Top Back Aid Mattress is a no flip mattress with a medium firm feel. The elegant stretch knit cover is multi quilted into a pillow top with Wolf’s own “Aerolife” fiber and a layer of dura foam. This pillow top mattress features sta-rite inner quilted fiber plus a layer of 1-inch firm foam with a hi-profile 288-coil innerspring.