The Bridgestone J15 Hybrid is a complete package. It features a FAST (Flex Action Speed Technology) crown design that allows the face to flex, which give you great ball speeds as well as better launch angles. The J15 Hybrids have Bridgestone’s thinnest face ever, to create the greatest distances and ball speeds. In addition the J15 also has Spin Control Technology, derived from an adjustable weight on the sole.