Altra Women's Superior Trail Running Shoe 90% Mesh/10% Leather Imported Rubber sole Asymmetric lacing structure Removable StoneGuard rock protection system 0mm heel-to-toe drop Dual-layer EVA midsole with A-Bound CheckerTrail outsole Weight: 6.9 oz Get off-road protection in a speedy, lightweight package with the Superior trail runner from Altra.