Futures Christenson Twin The Christenson Twin is a proven template designed for modern twin fin applications. It’s a pivot style template with an oversized base. This allows for good drive and speed down the line, while maintaining great release off the top. This fin adds a performance feel to your modern twin. Construction - Fiberglass Specifications Area 20.34 Height 5.40 Base 5.12 Foil FLAT Angle 5.0