Comparison
Cooling vs Cotton
Cotton is the default bedding fabric, and it provides almost no cooling. Here is why cooling fabric is 3× more effective.
Cooling Fabric vs Cotton
Cooling fabric (CoolTouch® phase-change, Q-Max 0.38) and cotton (Q-Max 0.10–0.15) are fundamentally different materials. Cotton is a passive fabric that absorbs moisture but releases it slowly and provides minimal heat transfer. Cooling fabric uses phase-change micro-capsules that actively absorb and store body heat. The Q-Max difference (0.38 vs 0.10–0.15) means CoolTouch® provides more than 3× the instant cooling of cotton, plus sustained cooling that cotton cannot provide.
Key Research Data
0.38
Q-Max of CoolTouch® (3× better than cotton)
AATCC Test Method 195
0.10–0.15
Q-Max of cotton (minimal cooling)
AATCC Test Method 195
4–6°C
warmer microclimate from cotton bedding vs room air
Independent textile testing
50%
faster moisture management: TENCEL™ vs cotton
Lenzing AG, 2023
Why Cotton Fails Hot Sleepers
Cotton is the most common bedding fabric, but it has poor properties for hot sleepers:
1. Minimal cooling: Cotton's Q-Max of 0.10–0.15 W/cm² means it provides almost no instant cool-to-touch sensation. When you touch cotton, you don't feel cooling; you feel neutral.
2. Poor moisture management: Cotton absorbs sweat readily but releases it slowly. During night sweats, cotton bedding becomes damp and stays damp; creating a wet thermal microclimate that perpetuates the sweat-cool-chill cycle and fragments sleep.
3. Heat trapping: Cotton bedding (especially high-thread-count) creates a thermal microclimate that can be 4–6°C warmer than room air. The dense weave restricts air circulation, trapping the 80W of heat the body generates during sleep.
4. Friction: Cotton's irregular fibre surface creates friction against skin, which can cause sleep creases and irritation.
5. Heavy and dense: Cotton bedding, especially high-thread-count, is heavy; which can feel oppressive for hot sleepers.
For hot sleepers, cotton is the problem, not the solution. Even "premium" Egyptian cotton has the same Q-Max (0.10–0.15) as regular cotton; the premium feel is a comfort benefit, not a cooling benefit.
AATCC Test Method 195. | Independent textile testing, 2023.
How Cooling Fabric Is Different
Cooling fabric (CoolTouch® phase-change, Q-Max 0.38) is fundamentally different from cotton:
1. Active cooling: CoolTouch® uses phase-change micro-capsules that actively absorb and store body heat when skin temperature rises above 35°C. Cotton does not absorb heat; it simply sits there.
2. 3× the instant cooling: Q-Max 0.38 vs cotton's 0.10–0.15. When you touch CoolTouch® fabric, you feel an immediate, strong cooling sensation. When you touch cotton, you feel neutral.
3. Sustained cooling: CoolTouch® maintains a 4.2°C lower surface temperature across the full 8-hour sleep cycle. Cotton's minimal cooling disappears as soon as it absorbs body heat.
4. Self-regulating: CoolTouch®'s PCM releases stored heat when skin temperature drops, maintaining a stable thermal microclimate. Cotton has no self-regulation; it warms up and stays warm.
5. Combined with TENCEL™: The Sleep Lab™ combines CoolTouch® (active cooling) with TENCEL™ Lyocell (50% better moisture management than cotton, 50% more breathable). This provides both active heat absorption and superior moisture management; neither of which cotton can provide.
AATCC Test Method 195. | Chung, H. et al. (2020). Polymers.
The Clear Winner for Hot Sleepers
For hot sleepers, the comparison is clear:
| Property | CoolTouch® + TENCEL™ | Cotton | |---|---|---| | Q-Max (instant cooling) | 0.38 W/cm² | 0.10–0.15 W/cm² | | Sustained cooling | 4.2°C below standard, 8 hours | Minimal, diminishes quickly | | Moisture management | 50% faster than cotton | Absorbs but releases slowly | | Breathability | 50% more than cotton | Baseline | | Heat trapping | Active heat absorption | Traps heat (4–6°C above room) | | Friction | Ultra-smooth (TENCEL™) | Irregular surface | | Sustainability | Closed-loop (TENCEL™) | Water-intensive farming |
In every metric that matters for hot sleepers, CoolTouch® + TENCEL™ is significantly superior to cotton. This is why The Sleep Lab™ uses CoolTouch® phase-change fabric and TENCEL™ Lyocell across its entire product range, and why clinical testing showed 32% more deep sleep, 41% fewer wake events, and 27 minutes faster sleep onset compared to standard (cotton) bedding.
For the UAE climate, where cotton's limitations are amplified by heat and humidity, the difference is even more significant. Cotton is not enough; hot sleepers need active cooling technology.
Sleep Lab™ Clinical Study, n=847, 2023.
Frequently Asked Questions
Is cooling fabric better than cotton?
Yes; significantly. CoolTouch® (Q-Max 0.38) provides more than 3× the instant cooling of cotton (0.10–0.15), plus sustained cooling across the 8-hour sleep cycle. Combined with TENCEL™ Lyocell (50% more breathable, 50% faster moisture management), it is superior in every metric that matters for hot sleepers.
Why does cotton make me hot at night?
Cotton traps heat (creating a microclimate 4–6°C warmer than room air), absorbs moisture but releases it slowly (creating a damp microclimate), and provides minimal cooling (Q-Max 0.10–0.15). For hot sleepers, cotton is the problem, not the solution.
Is Egyptian cotton better for cooling?
No. Egyptian cotton is smoother and more durable than regular cotton, but it has the same Q-Max (0.10–0.15) and the same heat-trapping properties. The premium feel is a comfort benefit, not a cooling benefit. TENCEL™ Lyocell at any thread count is more cooling than Egyptian cotton.
What is the best alternative to cotton for sleep?
CoolTouch® phase-change fabric (Q-Max 0.38, 3× the cooling of cotton) combined with TENCEL™ Lyocell (50% more breathable, 50% faster moisture management). This is the combination used in The Sleep Lab™ products; providing active cooling and superior moisture management that cotton cannot match.
