Take a bite out of the singletrack in the dynamic plush and rugged performance of the Altra Zero Drop™ Olympus 2 trail-running shoe!Altra Zero Drop recommends that those new to natural running and zero-drop footwear transition slowly by wearing these on shorter runs and gradually building up to regular mileage.Designed for the neutral runner seeking maximum cushioning. Ideal for trail running, hiking, fastpacking, and trail racing. Designed to help improve running form, toe splay, natural stability, push-off, comfort, and traction. Redesigned mesh and synthetic upper is softer and more flexible than the previous version.Lace-up closure. Foot-shaped toe box allows natural foot flex and toe splaying.GaiterTrap™ hook-and-loop tab allows for gaiter attachment. 5 mm Contour insole. Fully cushioned Zero Drop™ technology promotes a more natural foot strike and a more efficient stride.EVA midsole top layer absorbs impacting shock.A-Bound™ midsole bottom layer adds springy response to each stride. Natural Ride system (NRS) utilizes a combination of outsole and midsole componentry along with anatomical design, the Zero Drop platform and foot-shaped lasts to promote a more natural stride.Trail-specific sticky Vibram® rubber outsole delivers exceptional grip and traction for uphill and downhill terrain changes. Trail Claw™ tread pattern is positioned under the metatarsals for added traction during steep ascents and descents. Total Stack Height (total thickness of midsole and outsole underfoot): 36 mmBuilt on a SD6-M last.Imported. Measurements: Weight: 14 ozProduct measurements were taken using size 8, width B - Medium. Please note that measurements may vary by size.