Goya Surf Alu - Reduced Diameter BoomGoya Surf Alu Reduced Diameter Boom A boom is in fact one of the most important pieces of windsurfing gear. Its what you hold in your hands. Its what your kids hold in their hands. We kept this in mind while designing the Surf boom, made from T6 aluminum. The Surf is what we want our own kids to go sailing on. Its light and wont let your kid down, neither in fun situations nor in challenging ones. At 25. 7 mm it comes with a grip designed for kids