Caffeine Molecule Shirt cotton Caffeine molecule printed in Matrix green on a navy shirt 100% Cotton, Crew Neck Style You live and code by this alkaloid, why not wear your badge of addiction for all to see? Kind of like a scarlet molecule. Except it's green. Great for Caffeine Lovers! Length of T-Shirt measurement depends on size: Small 28", Medium 29", Large 30", XL 31", XXL 32", and XXXL 33"