The Stimulite Tension Adjustable Back — coded E2611 and E2612 — weighs 3 to 4 lbs. and has a weight capacity of 350 lbs. Contouring naturally to the user’s body, perforated honeycomb cells circulate air and evaporate moisture while equalizing pressure for comfort and stability. The “footprint” of the flexible honeycomb cells stimulates blood flow to enhance circulation and prevents bruises in the lower back. The back is naturally antimicrobial and completely recyclable, and is also machine washable. The cover is removable and breathable.