SLALOM The OverDrive focuses on maximum reaching speed with an increased twist and less back-hand pressure. A lighter weight means improved handling characteristics. A moderate width sleeve, 7 battens, and 3 cams provide draft stability through a huge wind range. Combined with a higher aspect ratio, the OverDrive M4 has impeccable handling characteristics; a lightweight feel, with a softer flex. Smaller sizes (5.5 and down) have 6 battens to increase flex and control for when conditions get extreme. The OverDrive M4 benefits directly from advances made on the Mach3 development. Increased depth below the boom adds drive and stability whilst the mid and upper leech have been opened more to decrease drag. Flow aligned battens further improve aerodynamics. The resulting performance is explosive acceleration and big numbers on the GPS. Key differences between the Mach4 and OverDrive are: / Sleeve width: 44% narrower than Mach4 for lower weight and less water retention. / Boom length: approx. 10cm shorter on most sizes for less back-hand pressure. / Lighter, softer feel.