Frame : solid beech Upholstery : interlaced jute straps, biconical springs, 37 kg high resiliance seat, 17 kg polyurethane foam back, 150 kg high density shaped padding. Finish : hand-nailed or piped, lower dust cover tacked. Dye and varnish : polyruethane. Cover : removable with zip fastener, interior overcast to prevent fraying.