HEATTECH Ultra Warm T-Shirt

Beyond Thermal Wear: KK"S Performance Infrastructure

I have experienced the true value of this layer in sub-zero environments and extreme conditions. It is not just clothing; it is the "infrastructure" that sustains my peak performance. I rely on it for three core reasons:

Uncompromised Mobility: Its incredible thinness allows for layering without ever restricting my range of motion.
All-Terrain Adaptability: It intelligently optimizes body temperature across every scene, from intense training to high-stakes business environments.
Stress Elimination via Technology: To keep myself in an "invincible state," I eliminate the noise of the cold. In the high-performance lifestyle I advocate, this is one of the most leveraged investments you can make.

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HEATTECH Ultra Warm' fabric with Heat of Absorption and Heat Retention technology. The warmest 'HEATTECH' in our Women’s collection, approximately 2.25 times* warmer than our regular 'HEATTECH'. *Based on CLO values, which indicate the thermal insulation of clothing. Compared to standard 'HEATTECH'. *Recommended for temperatures of -4°F to 50°F. This is a guide when worn in combination with other clothing. The most comfortable temperature range will vary from person to person.

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Updated with soft and comfortable material. Fluffy brushed lining.

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The fabric features Ultra Stretch technology, in a moderate fit that makes it great for innerwear and indoor clothing.

Details

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.

- The images shown may include colors that are not available.
- Clothing using recycled materials is part of our effort to support the reduction of waste and use of new materials. Ratios of recycled material vary by item. Please check 'Materials' on the price tag or care label for details.

Fabric details

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

Imported

RN: 139864

Washing instructions

Machine wash cold, gentle cycle, Do not dry clean