Gore-Tex® - A membrane that combines water resistance, wind resistance and exceptional breathability. Gore-Tex® coatings have pores smaller than water droplets but larger than water vapor particles. So rain and snow can't come in, but sweat can flow out. The bodywork remains dry and thermally comfortable no matter what the weather. Meta Rocker - A special midsole geometric layout that features a slightly different cradle between the heel and toe. This creates a unique supportive effect that makes it easier to position your feet correctly during running, supporting their natural technique. This translates into improved operational efficiency.