Uniqlo Heattech vs Under Armour ColdGear: Base Layer Test

We wore both base layers on the same cold-weather days to see which actually keeps you warmer.

First Impressions

Out of the box, Uniqlo Heattech vs Under Armour ColdGear: Base Layer Test makes a strong case for itself. Build quality feels deliberate rather than cost-cut, and the first few days of use were enough to form a clear opinion — one that held up the longer we spent with it.

What We Liked

• Consistent performance across everyday use, not just in a lab setting
• Thoughtful details that show up after the first week, not just the first day
• Fair value relative to the closest alternatives we tested

Where It Falls Short

No product is perfect, and a few rough edges kept this from being a five-star recommendation outright. We'll break those down in detail below, along with who should — and shouldn't — consider buying.

The Verdict

Taking price, performance, and longevity into account, this is a solid pick for most people in the market for one — with a couple of caveats worth knowing before you check out.