Run a few miles, scale a peak, and set your sights on your newest adventure with the upgraded Altra Footwear Olympus 3.5 trail running shoe. Predecessor: Olympus 3. Fit4Her technology caters to the specific form of the female foot, which has a narrower heel and midfoot, a higher instep, a longer arch and unique metatarsal spacing. Balanced Cushioning places the heel and forefoot at equal distance from the ground to promote proper, low-impact form throughout the run. Stack Height: 33mm. Durable, reinforced mesh upper provides all-day breathable comfort. Padded tongue and collar. Traditional lace-up closure. Soft fabric lining creates a comfortable wear inside of shoe. FootShape toe box allows your toes to relax and spread naturally for more comfort and stability during uphill climbs and downhill descents. Highly-responsive EVA midsole with InnerFlex flexible grooves delivers more speed and improved performance. Vibram MegaGrip rubber outsole with TrailClaw canted lugs positioned strategically beneath the metatarsals to provide traction at the toe off. Imported. Measurements: Weight: 10 oz Product measurements were taken using size 8.5, width B - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.