Chairs can be made from wood, metal, or other strong materials, like stone or acrylic. In some cases, multiple materials are used to construct a chair; for example, the legs and frame may be made from metal and the seat and back may be made from plastic.
Chairs may have hard surfaces of wood, metal, plastic, or other materials, or some or all of these hard surfaces may be covered with upholstery and/or padding. The design may be made of porous materials, or be drilled with holes for decoration; a low back or gaps can provide ventilation.
The back may extend above the height of the occupant’s head, which can optionally contain a headrest. Chairs can also be made from more creative materials, such as recycled materials like cutlery and wooden play bricks, pencils, plumbing tubes, rope, corrugated cardboard, and PVC pipe.
In rare cases, chairs are made out of unusual materials, especially as a form of art or experimentation. Raimonds Cirulis, a Latvian interior designer, created a volcanic hanging chair that is a handmade out of volcanic rock. Peter Brenner, a Dutch-born German designer, has created a chair made from lollipop sugar, made from 60 pounds of confectioners’ sugar