Brooks Women's Cascadia 5 Trail Running Shoe 100% Mesh and synthetic Rubber sole Full Length BioMoGo provides a more cushy first feel that lasts and is enviornmentally friendly Rearfoot and Forefoot Hydroflow enhance midsole cushioning Heel Pivot Posting System reduces the destabilizing effect of trail irregularities Ballistic Rock Shield protects the forefoot by spreading out point loads from sharp objects