The extraordinary comfort of the unobtrusive .‎03 chair is first revealed upon use: the seat shell, which is made of resilient integral skin polyurethane foam, adapts to the user's body and flexes slightly when the sitter leans back, aided by leaf springs embedded in the backrest.‎Materials:- Seat shell: integral skin polyurethane foam.‎ Shell with upholstered effect, self-supporting on a tubular steel frame.‎ Flexible backrest with integrated leaf springs.‎- Base: back legs in tubular steel, front legs in aluminium profile, powder-coated or chrome-plated.‎ Non-stacking versions.‎ Fitted with plastic glides for carpet or felt glides for hard floors.‎