Cold Weather Lightweight Thermal Undershirt

US Army Base Layer Top

This is the US Army's lightweight cold weather thermal undershirt, a base layer worn against the skin under uniform tops, fleece and shell jackets. It adds warmth without bulk, so it suits cool mornings, active work in the cold, or a first layer in a multi-layer system. Hunters, hikers, campers and anyone who wants genuine issue clothing for everyday cold-weather wear will get steady use out of it.

Features

• Genuine US Army Issue — Made for and issued by the US Army, not a commercial copy of a military design.
• Polyester Knit Fabric — Polyester holds less water than cotton and dries faster, which matters in a layer worn next to the skin in the cold.
• Lightweight Thermal Weight — A thin knit traps a layer of warm air while staying slim enough to fit under a fitted shirt or jacket.
• Quarter-Zip Mock Neck — A short front zipper opens the collar to dump heat during exertion and closes it to seal the neck when you stop moving.
• Stand-Up Collar — The raised collar covers the lower neck, a spot that loses heat quickly in wind.
• Ribbed Knit Cuffs — Stretch cuffs hold the sleeves at the wrist so they stay put under gloves and outer sleeves.
• Close Base Layer Fit — The body follows the torso so it layers cleanly without bunching under a blouse or jacket.
• Neutral Tan-Brown Color — A muted earth tone that matches current Army layering pieces and works with civilian outdoor clothing.

Built To Army Spec

As government-issue clothing, this undershirt was made to the Army's own requirements for a base layer that soldiers wear daily in cold conditions. The polyester knit, zip collar and ribbed cuffs are all part of that original design. Wear it alone in mild weather or under insulation and a shell when temperatures drop, and size it to sit close to the body like any base layer.