Four legs chair with casters 

The main element of the 5-Waves chair design is its
innovative injection-molded shell with dynamic seating
comfort – supporting the body without restricting its
movement.
5-Waves’ shell has 5 zones, or “waves”, each with its
own distinct properties:
the first “wave” provides rigidity– it is purely structural;
the second “wave” transitions between the structural
zone and springy zones;
the third “wave” offers support for the pelvis and lower
back;
the fourth “wave” provides springy dynamic support;
the fifth “wave” is an elastic outer zone reducing unnecessary
pressure on the soft tissues of the body.