ISUP The Blue Series Race Youth SUP. The BLUE SERIES MFT RACE TOUR YOUTH combine latest shapes, technology and value for money. These models are lightweight and ESPECIALLY DESIGNED FOR THE YOUNGEST RACERS with balanced handling that blend reactivity and stability in perfection. MONOCOQUE FUSION TECHNOLGY is a special manufacturing process where the pvc topcoat is "fusioned" to the drop stitch layer. This results in superior, lightweight and stiff inflatable sup boards - given the price point a benchmark in the industry. This small dimension has a smaller width. This enables the youngest racers to stay withe the paddle shaft and blade near to the side of the board to paddle straight. We recommend these boards for paddlers up to 65kg.