450 LB LOAD CAPACITY?BlessReach upgraded heavy duty roller walker features high quality aluminum tubing, a big advantage of strength is that the crossover tubing is welded to the front and rear tubing, not just bolted on. Although plastic is used in the brake lever and wheel assembly and a few other areas, the plastic parts used are heavy-duty and well-designed. Thicker Backrest & Upholstered Seat?The mobile walker with upholstered seat is very comfortable and the backrest is more comfortable than most chairs. If you're heavy and have a wide base, you'll also love this chair as it has a wide and deep seat for larger people. The fabric on the seat is waterproof. Adjustable & Foldable Design?Height can be adjusted from 33" to 40". When folded, the minimum size is 33.8” ? 9.5”, which can easily fit into the trunk of the car. Easy to carry and suitable for travel. Quick Lock & 8 inch Wheels?The lock mechanisms work easily and well. The brakes also are easy for you to use and are sensitive enough so they provide good control. 8 inch wheels that are big enough to navigate smoothly in rougher terrain,easily to walk on trails, grass, boardwalks. Multiple Guarantee of Safety?Like the bike, the walker equiped with easy-squeeze brakes. If you want to control the rolling speed on ramp surface, just hold it up; If you want to sit down or stand up from seat, just press it down.