Outer bag constructed out of Armorshield� Cordura to resist abrasion and fading. Inner bag constructed from mil-spec welded fabric. This is the same fabric used in survival vests worn by US fighter pilots. Inner bladder protected from zipper with V-diamond rubber. Pull dump on inside lower left Optional pull dump may be added to inside lower right Highly efficient drains empty water quickly after the dive. 3 upper grommets allow various height settings coupled with a lower slot that compensates for misaligned band bolts. The airway comes off the top back center of the cell. A safety cable inside the elliptical hose prevents hyperextension of the corrugated hose. Features the Apeks technical inflator with brass buttons