The new Spring Fall Skin Layer is 15% lighter than its predecessor. Despite those lost grams, it also has a more versatile construction, increased collar coverage, improved odorControl, and a more streamlined, body-mapped fit. The textile is woven tighter on the front panel to provide more insulation where warmth is critical. On the back and under the arms, a more open weave increases breathability and works to actively modulate your microclimate’s temperature, expelling excess body warmth to prevent overheating during full-gas efforts.