afghan air mattress band base basement basis bearing wall bed bed linen bedclothes bedcover bedrock bedsheet bedspread belt blanket bolster buffalo robe case clothes comfort comforter contour sheet couche counterpane course cover coverlet coverlid cushion deck eiderdown fitted sheet floor flooring fond footing foundation fundament fundamental gallery ground grounds groundwork hardpan innerspring mattress lap robe layer ledge level linen litter mat mattress measures overlayer overstory pad pallet patchwork quilt pavement pillow pillow slip pillowcase principle quilt radical riprap robe rock bottom rudiment rug seam seat sheet sheeting shelf sill sleeping bag slip solid ground solid rock spread springs stage step stereobate story stratum stylobate substratum substruction substructure superstratum terra firma thickness tier topsoil underbed underbedding underbuilding undercarriage undergirding underlayer underpinning understory understratum understruction understructure zone