Stay warm and protected in extreme cold with Men's 'HEATTECH' Ultra Warm T-Shirt, UNIQLO's most advanced thermal base layer designed for maximum insulation and comfort. Powered by cutting-edge 'HEATTECH' technology, this ultra-warm T-shirt captures body moisture and converts it into heat, delivering superior warmth without added bulk. The soft, stretchable fabric ensures a snug fit that moves with you, while moisture-wicking properties keep you dry and fresh all day. Whether layered under outerwear or worn solo, this thermal essential is perfect for winter commutes, outdoor adventures, or cozy indoor wear.

- 'HEATTECH' Ultra Warm Technology: Generates and retains heat for enhanced thermal insulation.
- Ultra-Warm Fabric: Provides maximum warmth while remaining lightweight.
- Soft and Stretchable Material: Offers a comfortable fit that moves with you.
- Moisture-Wicking Properties: Keeps you dry by drawing sweat away from the skin.
- Lightweight Design: Ideal for layering or wearing on its own in cold weather.-Essential Thermal Base Layer: Perfect for winter sports, travel, or everyday cold-weather outfits.

Compare 3 Types of 'HEATTECH' Fabric:

'HEATTECH'
- Lightweight yet warm, ideal for everyday layering.
- Recommended for 41 °F to 68 °F for mild winter days or cozy indoor wear.

'HEATTECH' Extra Warm
- About 1.5× warmer than original 'HEATTECH', offering added insulation without bulk.
- Perfect for colder days with recommended temperatures from 23 °F to 59 °F.

'HEATTECH' Ultra Warm
- Our warmest option, approximately 2.25× warmer than original 'HEATTECH'.
- Designed for more extreme cold with a recommended range of –4 °F to 50 °F.

Fabric details
35% Polyester, 34% Acrylic, 23% Rayon, 8% Spandex ( 35% Uses Recycled Polyester Fiber )
Imported

Washing instructions
Machine wash cold, gentle cycle, Do not dry clean