Designed for comfort, this big and tall office chair has 8 vibration modes and 6 waist vibration points. The big and tall office chair, with a heating feature up to 100 ℉, relieves fatigue from prolonged sitting. The seat height can be raised or lowered by three inches, and the backrest tilts from 90 degrees to 135 degrees . Designed as a big and tall ergonomic office chair, it ensures proper alignment for work or relaxation. Filled with high-density 25D sponge, this big and tall office chair provides a firm but cozy feel. Short plush upholstery feels silky. Certified by BIFMA, the robust five-star metal base supports up to 400 pounds, ensuring stability and durability. Easy installation with hardware and tools.