A form-fitting crew-neck undershirt from Nexkin — a Tier 3/4 technical apparel label — made from a proprietary stretch-weave fabric embedded with a passive thermal regulation mesh. The mesh doesn't require power; it's a phase-change material woven directly into the fabric that absorbs heat when the wearer runs hot and releases it when they cool down. The effect is subtle and real: not air conditioning, not heating, just a persistent effort to keep the wearer somewhere near comfortable. The shirt itself is seamless at the shoulders and sides, with flat-locked seams everywhere else.

It's designed to be worn under other garments and is almost aggressively uninteresting to look at — available in black, white, and a medium grey. The value is entirely in the wear. Tier 3 office workers, people with augments that run hot, and anyone who spends long hours in climate-inconsistent environments (construction, field work, transit) wear these as a quiet investment in their own comfort. Some Tier 4 professionals wear them under suits without mentioning it.