The Retro Moto Co. Classic Workshop Tee will definitely add horsepower to your bike probably, if not you'll at least look good
These are released in limited production runs so get yours while you can!
The Specs:
Regular fit
Crew neck
Mid weight, 180 GSM, 28-singles
100% combed cotton (marles 15% viscose)
Neck ribbing, side seamed, shoulder to shoulder tape, double needle hems, preshrunk to minimise shrinkage