Channel Islands K Step Up Surfboard Model Description: The K Step Up Surfboard from Channel Islands is a proven travel board. This is the board Kelly has turned to for the last few years as a 6’3” or 6’6” at places like the Mentawais and Teahupoo. When the waves get a little bigger or powerful, but you don’t quite need a gun, this is the board. Experience: Intermediate. Ideal Wave Size Head-high to Double-overhead.