Kirk Putnam and Brian Hilbers have been collaborating for years—two mad surf-scientists endlessly tinkering for the perfect shape. They've come up with many a wave tool, but none as radical as the SOS (Son Of Sam). This board is the ultimate long hull. Partially developed from Nat Young's mid to late 60s longboard mastery, the SOS takes it further; refining the rails and pulling in the template to bring out the ultimate down the line carving machine.