Inspired by bicycle helmet design, the FreedomAire Surgical helmet supplies surgeons with fresh air filtered of bloodborne pathogens such as hepatitis and HIV. The application of the blow-molding process to mold the hollow plenum shell proved to be a breakthrough in producing a lightweight, durable and cleanable system. Within 6 months of its introduction, Stackhouse had increased its domestic market share by more than 10 percent to become a market leader.