Because of Shallow Sport's original quadrihedral double tunnel design, you can fish a larger rig without losing your ability to run in super-shallow water. The double tunnel on the 21' Sport allows the same ratio of water to the prop as the 18,' offering you the same advantages on a larger rig. Also, added length helps to smooth the ride and increases running surface area, which results in a faster running boat and obviously provides extra fishing room for a few more of your buddies and/or clients. The 21' Sport now comes standard with an all one-piece composite Nida Core inner liner deck. This feature reduces weight, increases strength, and ensures your boat's life-lasting abilities.