Built in wedge cushion. Solid seat base. Four anti-bacterial colors to choose from (cushion): tan, mauve, mint and light blue. Cushions are independently secured and can be removed for cleaning. Ergonomic bent arms. User friendly independent elevating and folding footrest. Single wheel heavy duty zinc plated casters (4″, 5″ x 1 1/4″) come with removable bolt/nut for easy maintenance. All casters have threaded stem and are double wall reinforced with schedule 40 1″ PVC.