Cooling vs Linen

How Linen Cools vs How CoolTouch® Cools

Linen and CoolTouch® use fundamentally different cooling mechanisms:

Linen (Q-Max 0.18–0.20): • Passive cooling through air permeability: Linen has a loose, open weave that allows air to circulate through the fabric. • Moisture management: Linen absorbs moisture and releases it relatively quickly; better than cotton but not as good as TENCEL™ Lyocell. • No active heat absorption: Linen cannot absorb and store body heat. It provides a cooling sensation through air circulation, but this effect diminishes as the fabric warms. • Textured surface: Linen has a characteristic texture that some people find less comfortable against skin than smoother fabrics.

CoolTouch® Phase-Change Fabric (Q-Max 0.38): • Active cooling through phase-change materials: PCM micro-capsules absorb and store body heat when skin temperature rises above 35°C. • 2× the instant cooling: Q-Max 0.38 vs linen's 0.18–0.20. • Sustained cooling: The PCM continuously absorbs heat across the 8-hour sleep cycle, maintaining surface temperature 4.2°C below standard bedding. • Self-regulating: The PCM releases stored heat when skin temperature drops, maintaining a stable thermal microclimate.

For hot sleepers who need significant, sustained cooling, CoolTouch® is clearly superior to linen.

AATCC Test Method 195. | Chung, H. et al. (2020). Polymers.

Breathability vs Active Cooling

A common misconception is that breathability equals cooling. While breathability is important, it is not the same as active cooling:

Linen's breathability: Linen's open weave allows air to pass through the fabric, which helps evaporate sweat and provides a cooling sensation through air circulation. This is effective in dry, temperate climates where air can absorb moisture effectively.

However, in the UAE's humid climate (60–80% humidity in coastal areas), linen's evaporative cooling is significantly impaired. When the air is already saturated with moisture, sweat cannot evaporate efficiently, and linen's primary cooling mechanism is compromised.

CoolTouch®'s active cooling: CoolTouch® does not rely on evaporation; it uses phase-change materials that physically absorb and store body heat. This mechanism works regardless of humidity, making it effective in the UAE's humid climate where linen's evaporative cooling is impaired.

This is a critical distinction for UAE sleepers: linen may feel comfortable in a dry climate, but in the UAE's humidity, its cooling effectiveness is significantly reduced. CoolTouch®'s active heat absorption works regardless of ambient humidity.

UAE National Centre for Meteorology. | AATCC Test Method 195.

The Best of Both Worlds

Rather than choosing between CoolTouch® and linen, the best approach combines CoolTouch®'s active cooling with a superior breathable, moisture-wicking fibre. The Sleep Lab™ uses CoolTouch® + TENCEL™ Lyocell:

TENCEL™ Lyocell vs Linen: • 50% more breathable than cotton (and significantly more breathable than linen's already-good breathability) • 50% faster moisture management than cotton (and faster than linen) • Ultra-smooth surface (unlike linen's characteristic texture) • Naturally hypoallergenic • Closed-loop sustainable production

CoolTouch® + TENCEL™ provides: • Active heat absorption (CoolTouch® Q-Max 0.38); works regardless of humidity • Superior moisture management (TENCEL™); 50% faster than cotton • Ultra-smooth surface (TENCEL™); more comfortable than linen's texture • Sustained cooling across 8-hour sleep cycle (CoolTouch® PCM)

This combination is superior to linen in every metric that matters for hot sleepers; cooling, moisture management, comfort, and effectiveness in humid climates. It is why The Sleep Lab™ uses CoolTouch® + TENCEL™ rather than linen.

AATCC Test Method 195. | Lenzing AG. TENCEL™ Technical Data.