HEATTECH Product Information
UNIQLO HEATTECH innerwear is designed to keep you warm by absorbing moisture from your body and converting it into heat, while remaining thin, soft, and comfortable for layering.
This guide explains:
• Warmth levels and how to choose
• How to wear HEATTECH effectively
• Product lifespan and performance over time
HEATTECH Warmth Levels
How do I choose and wear HEATTECH for my trip?
HEATTECH Lifespan
Why HEATTECH performance may change over time
How can I maintain HEATTECH performance?
Frequently Asked Questions
1. HEATTECH (Normal)
• Lightweight and thin
• Suitable for mild cold weather
• Recommended: 5°C to 20°C
2. HEATTECH Extra Warm
• Around 1.5 times warmer than regular HEATTECH
• Suitable for cold weather
• Recommended: -5°C to 15°C
3. HEATTECH Cashmere Blend Extra Warm
• Similar warmth to Extra Warm with a softer feel
• Recommended: -5°C to 15°C
4. HEATTECH Ultra Warm
• Around 2.25 times warmer than regular HEATTECH
• Suitable for very cold climates
• Recommended: -20°C to 10°C
⚠️Note:
These recommendations are a general guide. The level of warmth required may vary depending on individual sensitivity to cold and activity level.
As a general guideline, HEATTECH items may be considered for replacement after about three seasons. In this context, three seasons refer to three winter seasons.
This guidance is not a strict requirement. Actual product lifespan may vary depending on:
With repeated wear and washing over multiple seasons, the functional fibers in HEATTECH may gradually experience reduced effectiveness. This may impact:
• Heat retention performance
• Moisture absorption and heat generation
• Overall comfort and fit
HEATTECH uses functional fibers, including polyurethane yarn, to provide stretchability and close body fit. Over time:
1. The polyurethane yarn may deteriorate
2. Fabric stretchability may decrease
3. The material may no longer adhere closely to the body.
As a result, heat retention performance may gradually decline, even if the product still looks intact.
⚠️ Important:
• Actual performance changes may vary depending on handling, washing, and storage conditions.
• Follow washing instructions
• Avoid excessive heat drying
• Store properly when not in use
• Replace when it no longer feels warm or comfortable
This guide explains:
• Warmth levels and how to choose
• How to wear HEATTECH effectively
• Product lifespan and performance over time
Table of Content
HEATTECH Warmth Levels
How do I choose and wear HEATTECH for my trip?
HEATTECH Lifespan
Why HEATTECH performance may change over time
How can I maintain HEATTECH performance?
Frequently Asked Questions
HEATTECH Warmth Levels
1. HEATTECH (Normal)
• Lightweight and thin
• Suitable for mild cold weather
• Recommended: 5°C to 20°C
2. HEATTECH Extra Warm
• Around 1.5 times warmer than regular HEATTECH
• Suitable for cold weather
• Recommended: -5°C to 15°C
3. HEATTECH Cashmere Blend Extra Warm
• Similar warmth to Extra Warm with a softer feel
• Recommended: -5°C to 15°C
4. HEATTECH Ultra Warm
• Around 2.25 times warmer than regular HEATTECH
• Suitable for very cold climates
• Recommended: -20°C to 10°C
How do I choose and wear HEATTECH for my trip
-
Choose based on your destination and temperature:
• Cool weather (e.g. Japan autumn, Taiwan winter)
→ HEATTECH (Normal) with light outerwear
• Cold weather (e.g. Japan or Korea winter)
→ HEATTECH Extra Warm with a sweater and coat
• Very cold climates (e.g. Europe winter, below 0°C)
→ HEATTECH Ultra Warm with multiple layers
• If you prefer a softer fabric feel
→ HEATTECH Cashmere Blend Extra Warm -
How to wear HEATTECH (layering tips):
For best warmth, wear HEATTECH as a base layer:
1. Base layer: HEATTECH (fit close to the body)
2. Mid layer: Knit or sweatshirt (helps retain heat)
3. Outer layer: Coat or jacket (blocks cold air)
👉 Tip: HEATTECH works best when it fits closely to the body rather than loosely.
⚠️Note:
These recommendations are a general guide. The level of warmth required may vary depending on individual sensitivity to cold and activity level.
HEATTECH Lifespan
As a general guideline, HEATTECH items may be considered for replacement after about three seasons. In this context, three seasons refer to three winter seasons.
This guidance is not a strict requirement. Actual product lifespan may vary depending on:
1. The frequency of wear
2. Washing and drying method
3. Storage conditions
4. Individual comfort expectation
2. Washing and drying method
3. Storage conditions
4. Individual comfort expectation
Why HEATTECH performance may change over time
With repeated wear and washing over multiple seasons, the functional fibers in HEATTECH may gradually experience reduced effectiveness. This may impact:
• Heat retention performance
• Moisture absorption and heat generation
• Overall comfort and fit
HEATTECH uses functional fibers, including polyurethane yarn, to provide stretchability and close body fit. Over time:
1. The polyurethane yarn may deteriorate
2. Fabric stretchability may decrease
3. The material may no longer adhere closely to the body.
As a result, heat retention performance may gradually decline, even if the product still looks intact.
⚠️ Important:
• Actual performance changes may vary depending on handling, washing, and storage conditions.
How can I maintain HEATTECH performance?
• Follow washing instructions
• Avoid excessive heat drying
• Store properly when not in use
• Replace when it no longer feels warm or comfortable
Frequently Asked Questions
-
1. Does HEATTECH have an expiry date?
No. HEATTECH does not have a fixed expiry date. The three-season guideline is a general recommendation, not a mandatory limit.
-
2. When should I consider replacing my HEATTECH?
If the item no longer feels as warm or comfortable as before, especially after several winter seasons of use, replacement may be considered.
-
3. Why does HEATTECH feel less warm over time even if it looks fine?
With repeated wear and washing, functional fibers such as polyurethane yarn may lose elasticity. When the fabric does not stretch and fit closely to the body, heat retention performance may decrease.
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(Including Public Holidays)
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Customer Care Operating hours:
Monday - Sunday: 9am - 6pm
(Including Public Holidays)
Monday - Sunday: 9am - 6pm
(Including Public Holidays)
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