ISUP The Blue Series Freeride Wide Youth SUP. The BLUE SERIES MFT FREERIDE YOUTH model is build for very lightweight paddlers and combines latest shapes, technology. If boards are too wide it´s nearly impossible to paddle the correct technique for kids. These models are lightweight and very stiff, 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.