Mike Sheldrake couldn't afford a new surfboard, but who needs cash when you've got brains. The guy built himself a legit surfboard that features a cardboard core (instead of foam). Since his first board he's been busy creating more prototypes and even caught Alex Knost's attention, who rumor has it bought one off Mike and then ripped on it.

Check out Mike Sheldrake's 'Cardboards' website for more information.