ThermoCarbon heat-retaining lining made of bamboo charcoal infused fibers and recycled fibers * Easy on and off offset back zipper with adjustable Velcro wrap collar and glued and blind stitched zipper flaps * UltraStretch neoprene sleeves and underarms; SuperStretch lower body * Glued and blind stitched seams with reinforced inner stress points * Less Seam-More Stretch, designed with minimal seams to maximize stretch