Features-Thermal-Jacket-Grey-suitable-for-the-cold-seasons-elastic-materials-designed-to-adhere-well-to-the-body-Can-be-worn-under-the-jacket-as-thermal-head-cold-&-periods-as-Sweatshirt-over-a-shirt-in-half-a-season-Zip-&-buttons-three-pockets-with-zippers-The-Tetratex-reg-Two-Stage-Dry-System-is-a-dual-layer-waterproof-breathable-seam-sealed-lining-system-The-first-layer-is-a-5000-2000mm-laminated-outer-shell-that-repels-99-of-initial-moisture-The-second-layer-is-a-fully-seam-sealed-inner-lining-with-a-20-000-30-000mm-Tetratex-reg-by-Du Pont-reg-waterproof-breathable-membrane-The-layer-of-air-between-the-two-layers-allows-the-Tetratex-reg-membrane-to-run-at-a-higher-operating-temperature-than-other-garments-that-have-the-waterproof-membrane-laminated-to-the-outer-shell-The-result-is-highly-increased-breathability-&-reduced-condensation-&-frosting-on-the-inside-of-the-jacket-similar-to-the-function-of-a-dual-pane-window-Tetratex-reg-Two-Stage-Dry-Technology-incorporates-the-Dry-Vent-System-which-features-waterproof-vent-zippers-backed-with-Dry-Vent-Mesh-to-keep-snow-&-moisture-from-entering-when-the-vent-zippers-are-open