The-FRONTIER-thermal-shirt-is-designed-to-be-worn-underneath-any-jacket-for-insulation-&-temperature-management-purposes-The-REVIT-Wind Barrier-reg-front-panel-helps-keep-the-body-warm-&-dry-while-the-high-neck-closure-has-been-relocated-to-the-side-This-helps-prevent-bulkiness-under-the-zippers-of-the-outer-shell-&-to-keep-wind-out-of-the-jacket-PROTECTION-FEATURES-Outer-shell-micro-polyester-REVIT-Wind Barrier-reg-Waterproofing-amp-Breathability-windproof-highly-breathable-water-repellent-ERGONOMIC-FEATURES-Fit-tour-fit-regular-Features-moisture-wicking-function-elastic-turtleneck-with-zipper-lt-7li-gt-overlock-seams