New foam for the seat's flip-up armrest and microfiber weaving 100mm butterfly reclining mechanism Class 3 gas lift (SGS test) 50mm PU wheels with a 320mm nylon base (tested up to 80,000 times) Adjustable range of gas lift: 100mm Size of wheel base: 640 mm Adjustable head rest 8cm up and down 40° recline 2 cm forward and backward 78° arm rest flip-up