A “term used to describe the intelligent combination of different preservation factors or hurdles to deteriorate the growth of microorganisms. Adherence to current good manufacturing practice, appropriate packaging, careful choice of the form of the emulsion, low water activity and low or high pH values are significant variables for the control of microbial growth in cosmetic formulations.” (Reference)
This is what we need to consider when it comes to hurdle technology: Good manufacturing processes, type of emulsion, pH, water activity, packaging, and other anti-microbial ingredients.