The O'Brien Nalu wakesurfer features an all new rocker profile, pushing the flat spot further forward and creating a board that excels on wakes large, small, and everywhere in between. Featuring a completely flat bottom and a single fin setup, the Nalu carries its speed up the face of the wake and waits for your latest move. Whether you're just cruising behind the boat or ripping like a pro, the Nalu wakesurfer delivers. Nalu 56: 4'8"L x 20.4"W. For 100-190 lb. riders. Nalu 64: 5'4"L x 21.5"W. For 170-260 lb. riders.