Solid pine and engineered hardwood frame with reinforced joinery. Concealed support legs for a streamlined profile (removable). High-gauge sinuous springs provide cushion support. Seat cushion has down alternative-wrapped, high-resiliency polyurethane foam cores. Seat firmness: Soft. On a scale from 1 to 5 (5 being firmest), we rate it a 2. Back cushion is filled with a down alternative and poly fiber blend. Cushion covers unzip to remove. Folds out to reveal Twin-sized mattress. Gel mattress features a 2-layer construction of high-density foam and gel-infused foam. It’s designed to contour to the body and wick away body heat. Mattress ticking has an ultra-soft, breathable knit. Accommodates West Elm Twin-sized sheets (sold separately). Removable legs. Made-to-order items are hand assembled and upholstered in the USA; stocked items are imported. Patent pending.