Tributary Inflatable's smaller self-bailing raft is the 13.0 SB. It is a traditional whitewater raft design with the tube diminishing slightly in the bow and the stern. This allows the 13.0 SB raft to punch waves easier than a raft with a larger bow and stern diameter. The two-layer system with a bladder on the inside and the very durable PVC outer skin, are a great combination for air retention and abrasion resistance. The piano hinge style of lacing makes this one of the fastest bailing rafts on the market.