Armchair with supporting tubular steel frame and seat chassis in steel with cross-woven coated rubber elastic straps. Padding in differentiated density polyurethane foam. Covering in 100% polyether thermally bonded onto a polyamide velveteen backing. Adjustable PVC feet. Fabric or leather upholstery, sewn together with a polyurethane foam mat through vertical seams at sight. The fabric upholstery only is fully removable by zippers and Velcro fastening.