It’s a good time for athlete’s heads, no matter what sport they play. Finally, after decades of primitive helmet technology, and wrapping our heads with nothing more than contoured styrofoam, the past few years have been a major improvement in proper protective equipment.  On an international level, American football has captured the attention of scientists, potential players, and parents. Concussion awareness has spread rapidly, and even the current and prior US presidents admitted that they’d be wary of their children playing football because of the risk and prevalence of concussions. Mainstream concussion awareness has trickled down into nearly every sport now with a huge emphasis on outdoor sports like mountain biking. Most of us are familiar with MIPS, as it’s been the most popular rotational impact system available. Mountain bikers may be less familiar with other systems designed to reduce the risk of concussion like WaveCel, Turbine 360, LDL, and SPIN. All of the following technologies were developed to reduce the likelihood of head trauma due to rotational forces of impact. At a high level, when a rider’s head is hit from an angle and gets knocked to the side or twisted,...