Family of 4 different small armchairs with shell in one-piece frame with steel insert and flexible, cold-expanded polyurethane foam. Seat frame in curved poplar plywood padded with polyurethane foam. Covering in 100% polyether thermally bonded onto a polyamide velveteen backing. Base in rectangular-section steel frame, with black epoxy powder coating. Fabric or leather upholstery, customized for each chair. The fabric version only is fully removable by zippers and Velcro fastenings.