3/2mm thickness.Back zip entry.Furnace Quick Dry Lining at font and back: large front and back seamless panels of a new double knit Furnace jersey creating pockets of air trapping body heat, as well as allowing it to drain and dry ultra fast.Superlight Foam Core: made from upcycled car tires, the light weight, high foam core offers excellent thermal retention.Superflex 250 Jersey: Durable hook & loop resistant high stretch jersey with excellent hand feel and low water absorption. Stretches 250% its usual resting state.Hidden GBS internal back zip with a #10 YKK brass slider.External seams: twin needle stretch blind-stitch.Internal seams: machine-applied pressure-bonded stretch tape.