JS Sub Xero HyFi 3.0THE FASTEST BOARD FOR SLOW WAVES. This is everything you want in small surf. To create the Sub Xero, we combined the new Xero with our long running summer favourite, the Psycho Nitro. It has the Nitros ultra fast low to flat rocker and full outline, but with the nose pulled in a touch, and a wider, straighter tail. In the engine room, vee in the nose prompts quick rail to rail transitions, moving into a deeper single to double concave, which helps the