Uniqlo Heattech Ultra Warm Crew Neck Shirt
The base layer that keeps you warm without bulk. 2.25x warmer than regular clothes, moisture-wicking, stretchy. Winter staple.
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Our Take
Uniqlo's Heattech Ultra Warm is the most advanced base layer in their lineup — 2.25 times warmer than regular clothing while remaining thin enough to layer under anything. Biowarming technology converts body moisture into heat.
The fabric blend (40% acrylic, 32% rayon, 21% polyester, 7% spandex) creates a unique combination: insulating warmth, moisture-wicking performance, four-way stretch, and shape retention. It feels soft against skin, not scratchy or restrictive.
Ultra Warm is the winter version — thicker and warmer than regular Heattech or Heattech Extra Warm. Ideal for freezing temperatures, skiing, winter hiking, or just surviving frigid commutes without bulky sweaters.
The crew neck design layers invisibly under dress shirts, hoodies, or sweaters. Anti-static treatment prevents annoying shocks. Machine washable and quick-drying. Available in multiple neutral colors that don't show under clothing.
What We Love
- ✓2.25x warmer than regular clothes
- ✓Thin enough to layer invisibly
- ✓Moisture-wicking + stretchy
- ✓Machine washable
- ✓Anti-static treatment
Watch Out For
- ✗Sizing runs small (order up)
- ✗Not ideal for high-output activities (too warm)
- ✗Can pill slightly after many washes