The Dermacalm Thermal Liner is a form-fitting undersuit that uses Zheng-Dao Bioelectric's adaptive thermoelectric mesh to actively suppress the wearer's infrared signature. The suit samples core body temperature through skin-contact thermistors and drives heat laterally through a network of peltier micro-channels, redistributing thermal output across a broad surface area and venting it downward through the soles at a diffused, low-intensity gradient. The result is a wearer whose thermal profile appears, to most IR detection systems, as ambient background noise rather than a human heat signature.

The Liner's distinctive feature is its biological awareness — rather than simply cooling the wearer to a fixed temperature, the mesh continuously adjusts its redistribution pattern based on exertion level, ambient temperature, and the specific IR band profile of detected scanning systems if a compatible threat-receiver module is attached. This adaptive quality means it remains effective during moderate physical activity, where simpler thermal suits tend to bleed heat from joints and the face. A separate insulated balaclava with micro-vent control is sold as an accessory for full facial IR suppression.

Zheng-Dao markets the Liner officially as a medical garment for patients with autonomic thermoregulation disorders, a classification that has kept it out of the most restrictive regulatory tiers. In practice, the medical market represents perhaps fifteen percent of actual sales. The remainder move through gray-market distributors, corporate procurement channels operating under healthcare exemptions, and outright black-market suppliers.