HygroHeat™ Technology
HygroHeat™: Patented Self-Heating Technology
HygroHeat™ is Laetts’ patented self-heating technology that powers the warmth behind every pair of our socks. Designed for performance in cold conditions, HygroHeat™ utilizes an innovative mechanism that transforms body moisture into sustained, intelligent heat—without bulk.
How it Works
At the heart of HygroHeat™ is a smart textile system that blends hygroscopic fibers with far-infrared (FIR) emissive ceramic particles. Together, these materials deliver a scientifically engineered warming process that transforms natural body moisture and heat into deep, lasting warmth—without batteries or added insulation.
By working in synergy, these components create an active thermal layer that keeps warmth balanced even under movement or pressure. This becomes especially effective when paired with BootGlide™, which minimizes friction inside boots so HygroHeat™ can focus entirely on warmth and moisture regulation rather than heat loss through mechanical resistance.
This process unfolds in three key steps:
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Step 1. Heat Capture
Ceramic-infused fibers absorb natural body heat and moisture from the skin.
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Step 2. FIR Conversion
Embedded ceramics convert, captured energy into far-infrared wavelengths.
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Step 3. Targeted Re-Emission
FIR energy is re-emitted toward key foot zones, reinforcing a steady sense of warmth.¹ ²
Inside the Technology: Ceramic-Infused Yarn
A close-up view of our performance yarn reveals ceramic particles embedded directly into the fiber structure. This built-in design allows HygroHeat™ to emit body-responsive FIR energy with no coatings or power sources.
Why it Matters
This moisture-activated system delivers what we call Smart Warmth™ — an intelligent, battery-free heating effect that adapts to cold and damp conditions. Designed to respond to your body, HygroHeat™ works when you need it most, offering thermal performance that traditional insulation can’t match.
For even greater comfort and endurance, HygroHeat™ pairs seamlessly with Laetts Compression, which supports circulation and muscle stability. Together, they help maintain warmth and blood flow during long periods of activity or recovery.
• 🔥 Up to 8.8 °C warmer than standard socks (verified in controlled lab tests)
• ♨️ Enhances blood circulation (clinically shown via improved tissue oxygenation)
• 🧦 Keeps feet light with no added bulk
• ❄️ Performs even when wet — ideal for snow, cold hikes, and winter sports.
From Patent to Performance
The HygroHeat™ technology is now officially patented. Based on our granted claims, the core of this innovation includes:
“Hygroscopic fibers that incorporate far infrared emission ceramic particles… configured to provide a heating effect when moistened or damp.”
This design is engineered into every pair of socks to ensure durability, consistency, and effectiveness in real-world conditions. It reflects the same dedication to problem-solving and material science described in Our Story — where Laetts was founded on the belief that comfort, warmth, and technology should work together naturally.
Engineered Warmth, Wherever You Go
Whether you're carving powder lines, hiking snow trails, or exploring the Arctic, HygroHeat™ ensures your feet stay warm, dry, and ready. Unlike traditional insulation, it adapts to your body's activity and moisture level—making every step a self-sustaining source of heat.
Explore two key studies below:
Laetts' HygroHeat™ technology is grounded in FIR textile research.
1. Washington,J. et al. (2018)
1. Washington,J. et al. (2018)
Randomized Controlled Trial Comparing the Effects of Far-Infrared Emitting Ceramic Fabric Shirts and Control Polyester Shirts on Transcutaneous PO₂. Journal of Textile Science & Engineering, 8(2), 1000349.
2. Vatansever,F. & Hamblin, M. R. (2012)
2. Vatansever,F. & Hamblin, M. R. (2012)
Far Infrared Radiation (FIR): Its Biological Effects and Medical Applications. Photonics & Lasers in Medicine, 1(4), 255–266. PMC Article
Read more about HygroHeat™ in Real Life
“It was the first time I didn’t dread putting on my boots.”
See All Performance Technologies
Explore more patented technologies on the technology page to see how Laetts integrates warmth, comfort, and performance across every sock system.