The Forgotten Layer
Billions of dollars are spent developing advanced ballistic fibers, sophisticated sensor systems, and state-of-the-art helmet platforms. Yet the layer that most directly affects an operator's performance, the fabric touching their skin, is often an afterthought. A sweaty, uncomfortable base layer leads to distraction, skin irritation, and thermoregulatory problems that degrade cognitive and physical performance far more than the weight of the armor itself. TENCEL Lyocell, Lenzing's eucalyptus-derived cellulosic fiber, addresses this overlooked challenge.
TENCEL fibers are produced through the lyocell process, which dissolves wood cellulose from sustainably managed eucalyptus plantations in a non-toxic organic solvent (N-methylmorpholine N-oxide, or NMMO). The dissolved cellulose is extruded through spinnerets into a regeneration bath, where the fibers solidify. Over 99% of the solvent is recovered and recycled in a closed-loop process, making lyocell one of the most environmentally responsible fiber production methods in commercial use.
Moisture Management
TENCEL's moisture management properties stem from its nanofibrillar structure. The fiber's surface consists of nanometer-scale fibrils that create a capillary network capable of absorbing and transporting moisture far more efficiently than synthetic fibers. TENCEL absorbs up to 50% more moisture than cotton and releases it more quickly, creating a fabric that feels dry against the skin even during intense physical exertion.
This moisture management is passive, requiring no chemical treatments that can wash out over time. The fibrillar structure is inherent to the fiber and maintains its performance through the entire service life of the garment. In contrast, synthetic base layers rely on DWR (durable water repellent) finishes or hydrophilic coatings that degrade with washing, progressively reducing moisture management performance.
Thermoregulation
Body armor creates a microclimate between the armor panel and the body. This enclosed space traps heat and moisture, creating conditions that accelerate heat stress. The base layer fabric must facilitate the transport of heat and moisture from the skin surface through the fabric and into the air space, where it can be removed by ventilation.
TENCEL's high moisture absorption rate creates an evaporative cooling effect on the skin surface. As the fiber absorbs sweat, it draws heat from the skin, providing a cooling sensation. This evaporative cooling is more effective than the wicking approach used by polyester base layers, which merely transport liquid moisture to the outer surface where evaporation may be impeded by the armor panel above.
Antimicrobial Properties
One of TENCEL's most valuable properties for tactical applications is its natural resistance to bacterial growth. The fiber's efficient moisture management means that the surface rarely provides the warm, moist conditions that bacteria need to proliferate. Independent testing has shown that TENCEL fabrics harbor 2,000 times fewer bacteria than equivalent polyester fabrics after 72 hours of wear without washing.
In field conditions where operators may not have access to laundry facilities for days or weeks, this antimicrobial property is not merely a comfort issue. Bacterial skin infections, including folliculitis, cellulitis, and fungal infections, are a significant cause of non-battle injuries in military operations. Any material that reduces the incidence of these infections directly contributes to operational readiness.
Blend Engineering
Pure TENCEL fabrics, while excellent for moisture management and comfort, lack the durability required for tactical base layers that must withstand the abrasion of armor panels and the stress of high-intensity physical activity. The solution is blend engineering, combining TENCEL with small percentages of other fibers to achieve optimal performance across all requirements.
GoatArma™'s base layer fabric uses a blend of 65% TENCEL, 25% merino wool, and 10% elastane. The merino wool contributes additional odor resistance, temperature regulation in both hot and cold conditions, and a natural UV protection factor. The elastane provides the stretch and recovery needed for a compression-fit garment that stays in position under armor without riding up or bunching.
GoatArma™ Implementation
The GoatArma™ comfort layer is designed as an integral part of the CAPRASKIN™, not as a separate garment. The base layer fabric is bonded directly to the inner surface of the armor carrier in strategic zones, ensuring consistent positioning of the comfort layer relative to the ballistic panels. This integrated approach eliminates the seam-on-seam contact between a separate base layer and the armor carrier, which is a common source of abrasion injuries during extended wear.
Our research with operator focus groups identified base layer comfort as the single most requested improvement in existing body armor systems. Operators consistently reported that existing body armor makes them hot, sweaty, and uncomfortable, leading many to remove armor during downtime when the threat has not actually diminished. By addressing comfort at the materials engineering level, GoatArma™ aims to increase the percentage of time operators actually wear their protection, which is ultimately the most important factor in whether armor saves a life.