These yokes are designed to pivot, allowing individualized adjustments in order to accomidate a multitude of body variations. Removeable yokes are also interchangeable between sizes.Can relace ''H'' straps for firmer, more comfortable trunk support. The inner core allows the support to be shaped around body contours, while the outer foam covering adds softness and comfort. Quick release buckles on each side of the chest support make a double opening front . A short strap mounts to the side or back of the chair. The lap belt has pivotal mounts so the pull at the hips comes at the desired angle.