Strong Glass Flex fins with Fiberglass reinforced Nylon construction by DORSAL with Futures compatible bases. These performance tri-fins are based on G-5 fins, design suited for middle to experienced level surfers. The two fin profiles used together create high drive for down the line speed and having the smaller back fin means they also offer great maneuverability. The combination of these tuned design elements with a strong durable nylon glass fiber composition ensures a great quality fin.