Unifiber Carbon HD Monocoque V2 BoomUnifiber Carbon HD Monocoque V2 Boom The HD (Heavy Duty) 70% pre preg carbon lay up strikes a superb performance balance between stiffness, durability and price. Tube walls are further reinforced to withstand heavy abuse and reduce wear and tear. Shorter sizes are paired with narrow tails to fit a more compact sail profile often used for Bump & Jump and Wave sails. Sizes 190 and 220 are fitted with larger diameter outside tails that minimizes the back