Women's Topo MTN Racer 4 High Cushion Trail Runner Size:6.5 This upper can handle rugged Accessory size:M L This upper can handle rugged terrain over trails in the rocky mountains while keeping your foot cool and clean during long hot hikes Altra EGO midsole – This proprietary foam offers a responsive yet moderately cushioned ride—providing comfort without sacrificing trail feel Customers had mentioned that previous Topo insoles could become wet on rainy and humid days so they created an insole that would eliminate blistering and moisture containment within the shoe The MTN 4 Racer includes Topo’s updated proprietary Zip Foam™ material allowing the Men’s MTN Racer 4 to have increased cushioning without increasing weight