PROTON is an armchair in keeping with EN standard 1335-1/2/3 type C. Models with swivel base have adjustments for:
- seat height and back angle through levers located under the seat,
- backrest tension, with knob located under the seat,
Seat height is controlled by a gas lift. All swivel armchairs are standard equipped with hard wheels for soft floors. Soft wheels (bicolour) must be requested for hard floors.
* The modern armchairs are standard equipped with elastic home strips and upholstered fixed arms.