Cooling vs Bamboo

Different Cooling Mechanisms

Cooling fabric (CoolTouch®) and bamboo use fundamentally different cooling mechanisms:

CoolTouch® Phase-Change Fabric (Q-Max 0.38): • Active cooling: Phase-change micro-capsules absorb excess body heat when skin temperature rises above 35°C, storing it rather than reflecting it back. • Instant cooling: Q-Max 0.38 provides a strong cool-to-touch sensation on skin contact. • Sustained cooling: The PCM absorbs heat continuously 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.

Bamboo Fabric (Q-Max ~0.20): • Passive cooling: Bamboo provides cooling through moisture management; it absorbs and releases sweat to facilitate evaporative cooling. • Mild instant cooling: Q-Max 0.20 provides a mild cool-to-touch sensation, about half of CoolTouch®. • Decreasing cooling: Bamboo warms as it absorbs body heat; the cooling effect diminishes over the sleep cycle. • No active heat absorption: Bamboo cannot absorb and store heat the way phase-change materials can.

The key difference: CoolTouch® actively absorbs heat (like a heat pump), while bamboo passively manages moisture (like a towel). For significant, sustained cooling, phase-change fabric is clearly superior.

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

Q-Max Comparison

Q-Max is the textile industry standard for measuring instant cool-to-touch sensation. Here is how CoolTouch® and bamboo compare:

• CoolTouch® phase-change fabric: 0.38 W/cm² • Bamboo fabric: ~0.20 W/cm²

CoolTouch® provides nearly 2× the instant cooling sensation of bamboo on skin contact. This means when you first touch CoolTouch® fabric, you feel a significantly stronger cooling effect.

But the Q-Max difference is only part of the story. The sustained cooling performance over the 8-hour sleep cycle is where the difference becomes dramatic:

• CoolTouch®: Maintains 4.2°C below standard bedding across the full sleep cycle. The PCM continuously absorbs heat, maintaining a stable cool surface. • Bamboo: Starts with mild cooling but warms as it absorbs body heat. By 2–3 hours into sleep, the cooling effect has diminished significantly.

For hot sleepers who need cooling throughout the night; not just at bedtime; CoolTouch® is the clearly superior technology.

AATCC Test Method 195. | Sleep Lab™ Clinical Study, 2023.

The Best Approach: Combine Both

Rather than choosing between CoolTouch® and bamboo, the best approach combines CoolTouch®'s active cooling with a superior moisture-management fibre. This is exactly what The Sleep Lab™ does:

Instead of bamboo (Q-Max 0.20, moderate moisture management), The Sleep Lab™ uses TENCEL™ Lyocell (Q-Max 0.25, 50% better moisture management than cotton or bamboo) combined with CoolTouch® phase-change fabric (Q-Max 0.38).

This combination provides: • Active heat absorption (CoolTouch® Q-Max 0.38); sustained cooling across the sleep cycle • Superior moisture management (TENCEL™ Lyocell); 50% faster than cotton, prevents damp-heat • Better than bamboo in both metrics; higher Q-Max and better moisture management

This is why The Sleep Lab™ products use CoolTouch® + TENCEL™ rather than CoolTouch® + bamboo or bamboo alone. The combination provides the most comprehensive cooling available; active heat absorption plus superior moisture management.

For hot sleepers in the UAE, this combination is especially important: the high humidity prevents effective evaporative cooling with bamboo alone, while CoolTouch®'s active heat absorption works regardless of humidity.

AATCC Test Method 195. | Lenzing AG. TENCEL™ vs Bamboo Comparison.