The F4 Fiberglass is the stiffest, most durable version of the popular F4 template. This balanced template with a thicker tip make it a favorite in all conditions while the Fiberglass is ideal for control in powerful surf with additional durability in reef breaks.
Small (105lb - 155lb) (47kg - 70kg)
Fiberglass is stiff and tough for heavy conditions or surfers that appreciate very stiff fins.
A tool to help you surf better.
Flat foiled fins break free sooner, and are better at controlling speed. Often surfers prefer them in fast powerful surf where they do not need to create additional speed. If you have muscle memory from riding glass-ons, flat foiled fins will feel the closest.