“12 Valve Cummins” This one's for the 12-valve diehards — the ones who know timing, fuel, and boost are all you need. Printed on our toughest tee, this shirt holds up like the block it represents. Thick, durable cotton with a soft hand feel, it’s pre-washed for that broken-in look and built to ride through whatever the day throws your way. Mechanical by nature. Legendary by choice. Size Guide Fits true to size with a relaxed cut. If you're between sizes or want a roomier fit, size up. Size Chest Width Body Length Fits Like... S 18–19" 27–28" Standard Fit (Slim) M 20–21" 28–29" Relaxed Fit L 22–23" 29–30" Easy Fit, Layer-Ready XL 24–25" 30–31" Oversized or Broad Chest 2XL 26–27" 31–32" Full Cut, Max Comfort 3XL 28–29" 32–33" Loose Fit, Big Guy Ready
