Bio-mechanically correct seat angle provides proper support Self adjusting parts nd angles Gas assist back support easily adjusts for proper positioning Quick release to engage and disengage thigh hold-down support Weight stack safety shields full length and dual-sided High strength Mectral steel reinforced Kevlar® belt (6) primary frame colors, and (16) different upholstery colors available Custom finishes, upholstery, and embroidered wear covers available Standard 220 lbs. steel weight stack with patented add-on weight system