Embrace the cold with confidence in the Women’s ’HEATTECH' Ultra Warm High Neck T-Shirt, UNIQLO's warmest thermal base layer designed for maximum insulation and comfort. Featuring advanced ’HEATTECH' Ultra Warm technology, this long-sleeve top captures body moisture and converts it into heat, delivering superior thermal performance. The high-neck design adds extra coverage and warmth, while the brushed interior enhances heat retention and feels luxuriously soft against the skin. Ideal for layering under winter coats or wearing solo, this thermal T-shirt is perfect for outdoor adventures, travel, or everyday wear in cold climates.

- ’HEATTECH' Ultra Warm Technology: Generates and retains heat from body moisture for optimal thermal insulation.
- Extreme Cold Protection: Our warmest thermal base layer, specifically designed for comfort in temperatures ranging from -4°F to 50°F.
- Brushed Interior Fabric: Enhances warmth and provides a soft, cozy feel.
- High-Neck Design: Offers added coverage and protection against cold air.
- Heat-Retaining Stretch Fabric: Moves with your body for a snug, flexible fit.
- Moisture-Wicking Properties: Keeps you dry and comfortable throughout the day.
- Long Sleeves for Full Coverage: Ideal for layering or standalone wear.
- Ultimate Thermal Base Layer: Perfect for winter sports, travel, or daily 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.