Vivobarefoot Men's Breatho Trail M Trail Running Shoe,Black/White,40 EU/7 M US 100% Polyester, Polyuretahne, Lycra Imported Rubber sole 0mm heel-to-toe differential Multidirectional lugs Puncture-resistant midsole layer Anatomical toe box Built for muddy, wet trails, this trail runner from Vivobarefoot offers ample breathability and aggressive tread.