Xero Shoes TerraFlex Trail Running Hiking Shoe - Minimalist Zero-Drop Lightweight Barefoot-Inspired - Men, Forest Green, 9 D(M) US. Features : TRAIL-GRIPPING -- a 4mm lugged sole gives you incredible traction -- uphill, downhill, fast, or slow, in dry and wet conditions. COMFORT - The foot-first, natural movement design lets your feet bend, flex, move, and feel the world the way they're supposed to. PROTECTION - 6mm of FeelTrue rubber, with an embedded 3mm BareFoam layer smooths out the rough spots. LIGHTWEIGHT and TRAVEL-FRIENDLY - They won't weigh down your pack, and work great on and off the trail. IMPORTANT SIZING NOTE: As of August 20, 2019 the TerraFlex was resized to fit "true to size." We recommend ordering your typical shoe size. Of course, if this isn't correct, you can exchange it for the right size.