The Guide continues to outpace the pack by driving innovation with each update. The 10th edition delivers the ideal Guide running experience with a streamlined midsole design, dynamic engineered mesh upper and Tri-Flex outsole with enhanced forefoot flexibility. Fast feels a little faster in the Guide 10. ? Engineered mesh upper for a dynamic, lightweight fit ? EVERUN Topsole construction for enhanced energy return and continuous cushioning throughout the run ? Refined TRI-FLEX outsole design provides greater ground contact and flexibility ? Added midfoot structure for the ideal hold and support for the runner in motion ? Lightweight FLEXFILM overlays provide structure and support