UL stands for ULTRA LIGHT and this is the lightest freestyle fin on the market, It derivates from the Freestyle Pro, made with new composites components such as carbon powders and stripes, Vectran cloth, We worked on this project for full year testing different layups until we reached our target, We produced 300 fins with this model/construction for our special freestyle customers, Each fin will have its own serial number and it is a unique product.