Redline is a street crew operating across the Tier 1-2 boundary in the northwest Shelf grid, and their colors are a specific arterial red — not cherry, not brick, not maroon, but the particular red of a warning light at maximum intensity. The muscle tee is their primary identifier: a sleeveless, wide-arm-hole cut in a heavy cotton-analog jersey, dyed in-house in that red, with a crude stenciled logo on the back — a stylized gear-and-lightning design that varies slightly between batches depending on who's doing the stenciling. No brand. No label. Just the color and the mark.

Wearing this without being Redline is a decision with consequences. Wearing it while being Redline is a daily statement of territory, affiliation, and mutual obligation. The shirt itself is nothing special — the dye fades slightly with washing, the stencil cracks at the edges after a few months — but the meaning doesn't fade with the fabric. Some longtime members have kept faded, cracked versions as a kind of archive. New members get a fresh one. There's no ceremony. You just get the shirt.