Material: Made using high-density thick foam and nylon caster wheels. Desk chair: Get an ergonomic office chair! Ergonomic: Curved backrest with adjustable lumbar support. Base: With a sturdy, five-star wheeled base so you can move around easily. Features: A 10cm-adjustable gas lift seat with reclining function of 90-115°. Colour: Choose from black or white colours. Ergonomic Office Chair | Black | Living Social