UnderWarmer Heated Compression Baselayer

How the UnderWarmer Baselayer Works

Most heated apparel is outerwear you put on over everything else, but UnderWarmer flips that idea by building the heat into a slim compression baselayer that goes on first, closest to your skin. That placement matters, because heat delivered directly against the body warms you far more efficiently than heat trapped under layers, and the compression fit keeps the heating elements in constant contact with your core. The result is warmth you can wear invisibly under a dress shirt, uniform, or ski shell without adding bulk.

Base-layer heat, done right

Worn against the skin, the vest's heating zones warm your core and back directly, then you layer normally on top. It's the most efficient way to stay warm because nothing sits between the heat and you.

Invisible under anything

The slim compression cut means it hides under work clothes, uniforms, and outerwear without bulk, ideal when you can't wear a bulky heated jacket. Compare more options in our heated base layers collection.

Build a full warm layering system

Pair the UnderWarmer vest with heated extremities for head-to-toe warmth. Add our heated socks and heated gloves for the coldest days.

Shop related collections: Heated Base Layers | Heated Vests | Heated Socks | Heated Gloves