Seasoned beech and poplar solid wood.

Springing: non-deformable elastic belts.
Padding: different density foam polyurethane.

Seat: sterilized natural goose down, with stabilizing insert of foam polyurethane.

Walnut (light, medium, dark), cherry wood or wengè painted.

Top-grain leather, first choice
Full grain genuine leather
Full grain leather shiny look
Aniline leather
Nubuk leather
Fabric (removable cushions)