The world champion adaptive snowboard cross athlete repairs his own prostheses before a competition.

When he was 27, snow cross racer Mike Schultz (who got the nickname “Monster Mike” because of his renowned fearlessness) drifted off course in a race, flew off his snowmobile, and obliterated his knee. It required multiple surgeries and multiple days in a coma to save his life. Ultimately, his medical team had to amputate his leg.

Rather than give up his love of action sports, Schultz engineered his own prosthetic knee and founded his own high-performance prosthetic company, BioDapt. His prostheses use a patented proprietary linkage system and mountain bike shocks to dial in such precise performance, enabling him to return to compete at the highest levels of the sport. Since 2008, he has won multiple Winter Paralympics and World Championships for adaptive snowboard cross and banked slalom.

More importantly, however, extreme athletes, amputees, and veterans all use his prosthetics. That includes many of his competitors, whose gear he ...