Product Launch · June 2026

The Answer Was
Lyocell.

Two weeks ago, we told you something new was coming — a new PCM host fiber, botanically derived, built for next-to-skin comfort. Today, we’re ready to tell you exactly what it is.

✦ Skinkey™ PCM Lyocell Staple Fiber — Now Revealed

June 2026 · Skinkey™ Innovation Series

Eucalyptus forest — the botanical origin of Lyocell

A few weeks ago, we introduced the idea of a new PCM host fiber — one that was botanically derived, softer, and designed specifically for next-to-skin contact. We kept the name to ourselves. Today, that changes.

The new host fiber is Lyocell. And the choice was not accidental.

“When we set out to find the right host fiber for PCM in intimate and next-to-skin applications, we weren’t looking for the most common option. We were looking for the most appropriate one.”

Lyocell is a cellulose fiber derived from wood pulp — most commonly eucalyptus — produced through a closed-loop solvent spinning process that recovers and reuses over 99% of the solvent used. It is one of the most environmentally responsible fibers in modern textile production, and it brings a set of physical properties that make it uniquely suited to host PCM technology close to the body.

Why Lyocell — The Properties That Matter

Botanical Origin

Derived from sustainably sourced wood pulp via closed-loop solvent spinning. Over 99% of the solvent is recovered and reused — a genuinely low-impact production process that aligns with responsible material development.

Exceptional Softness

Lyocell fibers have a naturally smooth surface and fine hand feel — often described as softer than cotton. For next-to-skin and intimate applications, this is non-negotiable.

Skin Affinity

As a cellulose-based fiber, Lyocell is chemically closer to the skin’s natural environment than synthetic alternatives. Gentle, hypoallergenic, and well-tolerated even by sensitive skin.

Superior Moisture Management

Lyocell absorbs moisture efficiently and releases it quickly — keeping the skin dry and comfortable. This works in direct synergy with PCM’s thermal buffering mechanism throughout the night.

Breathability

The fiber structure allows air and moisture vapor to move freely — essential for sleepwear, intimate apparel, and bedding where thermal regulation matters most during extended wear.

PCM Compatibility

The internal structure of Lyocell staple fiber provides an effective matrix for PCM integration — holding the functional component stably within the fiber, not just on its surface.

Product Specification

Fiber Type Lyocell PCM Staple Fiber

Fineness 1.2D Denier

Cut Length 38 mm Standard staple

Technology Skinkey™ PCM Phase Change Material

Host Fiber Origin Botanical Wood pulp · Closed-loop

PCM + Lyocell: Why the Combination Works

PCM technology works by absorbing and releasing heat at a specific temperature threshold — creating a microclimate buffer between the body and its environment. But the host fiber determines how that technology is delivered to the skin.

Synthetic filament yarns offer durability and consistency. Surface-finished fabrics offer versatility. But for sleepwear, intimate apparel, and premium bedding — where the fabric is in constant, direct contact with the skin — neither is the ideal answer.

Lyocell brings the missing element: a host fiber that is soft enough to wear against bare skin, breathable enough to support the body’s natural thermoregulation, and botanically derived enough to align with the values of premium, conscious textile development. Paired with PCM, it doesn’t just cool — it manages. It doesn’t just touch the skin — it works with it.

A Note on Positioning

Skinkey™ PCM Lyocell is a high-value functional fiber. It is priced accordingly — and intentionally so. PCM technology requires precision in both material selection and manufacturing, and Lyocell as a host fiber adds further cost through its responsible production process.

This fiber is designed for brands that compete on quality, comfort, and material integrity — not on price. It is not positioned for commodity cooling products or low-cost functional claims. If your brand is building around genuine skin comfort and a premium next-to-skin experience, this is the material for that conversation.

Author

Annie Kwok

CEO Founder at Annie's Smartex

Annie Kwok is the CEO & Founder of Annie's Smartex, with 18+ years of expertise in functional fiber R&D. She has led the development of 20+ patented textile technologies, including cooling, antibacterial, and biodegradable yarn systems, serving clients in 30+ countries worldwide.