50% Airlite Superflex G3; Super flexible Nylon spandex jersey laminated to an airlite foam core. This material is incredibly flexible yet durable. GBS Construction. Furnace thermal lined chest panel. EPP Ergonomic performance panelling. Contour Flex; Strategically placed under arm and side panels for maximum flexibility. Chafe free strategic seam placement. 3D Moulded Supratex Knees. Abrasion resistant 3D moulded knee pads for flexibility and durability. Single layer raw edge collar. Zip Strut ; Removing any stress applied to the zip head, a small but important solution to any abuse to the zip. Drymax water resistant back zip entry, combined with internal overlapping zip flaps creating a more water tight closure; Internal key loop.