FLYSURFER Kiteboarding designer Armin Harich walks us through the long and short Mixer Test of our SOUL closed-cell foilkite. With this technique you have the option to pimp your SOUL for maximum performance without any tools. If you know how to perform the short Mixer Test, it is simple. The long Mixer Test just includes the complete bridle in the measurement to make it more accurate, so you can compensate for shrink/stretch of the lines over time.