Plastic legs with twist height adjustment and built in numbering system to keep all legs level. Ergonomic backrest. Large wide flanged rubber tips for additional security. 
Features:
Now with, Microban(R) anti-microbial product protection 
Large contoured seating surface (18"x20") 
Tool-Less Assembly: No hardware required: Snaps together in seconds! 
Plastic legs with twist height adjustment and built in numbering system to keep all legs level 
Large wide flanged rubber tips for additional security 
Specifications:
Product Weight Capacity: 400 lbs
Frame: Tool-less assembly; NO HARDWARE 
Seat Surface Depth: 18" 
Seat Width: 20" 
Seat Height: Range with height adjustments: 15"-21" 
Height Adjustment: Seat to floor height adjustment range: 15"-21" 
Seat To Back Height: 14-1/4" 
Overall Width: At Base: 16-1/4" 
Overall Depth: At Base: 17-1/4" 
Shipping Product Weight: 13 lbs 
Warranty: Limited Lifetime 
Color: White