Formula is the name that the German designer Matthias Demacker chose for its new projects for the seat made the Italian brand Declic Area Arrmet. Sled Formula 40, Formula 40 and X-Foot stool swivel Formula 80, are three models feature a rugged construction and ergonomic made of steel, coated with flame-retardant foam is not removable, that can be covered in wool, leather or eco-leather of different colors. The ergonomic design is modern and versatile, available in three seat options, makes it a perfect formula to fit all needs and practice style.