TAMA's most popular 1st Chair throne employs a saddle-type seat filled with molded urethane foam that will hold its shape for years to come. 12mm thick plywood at the bottom of the seat provides extra strength and security. The Wide Rider is available with a durable PVC seat (HT530), or a special fabric cloth top (HT530C). Adjustable Height Range : 450mm-640mm (17 3/4" - 25")