[2026] Next-Gen Innerwear 'CORE SHIELD®' Blocks Solar Heat Sources for Advanced Heatstroke Protection

A New Paradigm Shift in Dealing with Extreme Heat

Japan's summers have reached a level that threatens life itself, making traditional methods like hydration and standard 'contact-cooling' innerwear insufficient. Most previous countermeasures were merely reactive treatments after the body had already overheated.

Why Conventional Cooling Innerwear Fails

'Contact cooling' only addresses heat transfer at the moment of contact with the fabric. Near-infrared rays, which make up about 50% of sunlight, penetrate typical innerwear and heat the core of the body directly. This is the primary reason the inside of clothing turns into a sauna-like environment.

The Scientific Thermal Shielding Mechanism of 'CORE SHIELD®'

Developed by PNX, 'CORE SHIELD®' incorporates 'CWO®', a special ceramic nanoparticle developed by Sumitomo Metal Mining, into its fibers. CWO® is an ultra-high-performance thermal shielding material used in aircraft and advanced building windows. Through this technology, the product has successfully suppressed temperature rises inside clothing by up to 2°C, even under direct sunlight.