The Keel twin is short, wide and thick with a flat rocker for lots of fun and high speed, perfect for smaller waves, however, these boards can be extremely functional in good quality waves. 
 
The classic Keel Twin fish was developed inthe mid-’70s as a kneeboard by Steve Lis. Pintail surfboards were a favourite of his, but his swim fins would hang over the side creating drag. He decided to split the tail, giving him thewidth needed to support his fins, while still holding on to the performance characteristics of a pintail.
 
It wasn’t long until he had refined the design to suit stand up surfers, and the fish design took off.