Plus Size packs are designed with extended length shoulder straps and hip belts, plus additional fit revisions to accommodate larger body shapes and sizes. Plus Size fit is comparable to 2x-6x in apparel sizing and the torso sizing remains consistent with all other Gregory products. See our Fit Chart for complete fit dimensions. BioSync flexible hipbelt and shoulder harness that stretch and move with the natural motions of your body. Adjustable torso length that is connected edge to edge to balance the load and provide 3.5" / 9 cm of adjustment. Channeled foam backpanel featuring aerodynamic grooves to promote air movement and keep your back cooler. Perforated, padded shoulder harnesses with flexible edge construction for dynamic, breathable comfort.