A long-sleeve fitted base layer from Pragma Systems, the augmentation-adjacent apparel division of a larger biotech corponation. The shirt itself looks unremarkable — a matte charcoal or off-white compression top with flat seams and a crew neck — but the fabric is woven with a distributed thermal-regulation mesh that responds to body temperature, venting when core temperature rises and tightening insulation when it drops. The response is passive and requires no power source; it's a material property, not an electronic system.

The real selling point for the augmented community is the construction: the shoulder and upper arm panels are reinforced with micro-articulated seams that flex and recover around subdermal chrome, and the fabric at the wrist can be cut and heat-sealed without fraying, allowing custom openings for hardwired ports or sensor arrays. It's marketed to 'active professionals' but the aug-community forums have made it their own.