Vibram FiveFingers KSO Trek Sport Women's Trail Shoes mesh TPU Toe Protection - For enhanced forefoot protection. Antimicrobial Microfiber footbed - Seamless 2mm Footbed Insole - stitching free, to reduce friction and improve comfort Razor Siped Outsole - For added flexibility and slip resistance. Heel and Instep Hook and Loop Closures - Helps pull the upper tight round the contours of your feet so it feels like a second skin.