1. 2 to 1. 4mm cowhide. Removable spine pad with pocket for optional C. E. spine protector. Dual Density Armor in Elbows & Shoulders. Removable insulated vest liner. Variable Flow ventilation system. Full Flex windproof sleeve panels. Elastic sleeve adjusters. Reflective stripe. Sure Fit adjustable waistband. 8 zipper for pant attachment.