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Zappos.com is proud to offer the Nike - Air Alvord VII (Black/Metallic Silver-Sport Red) - Footwear: This trail running shoe was built to withstand the wear and tear of off-road running while keeping you comfortable and protected. ; Lightweight mesh upper enhances ventilation for comfort and breathability. ; Strategically-placed synthetic overlays provide trail-specific support for a snug, secure fit and great lockdown. ; Durable, welded rand enhances support and provides water resistance on the trail. ; Encapsulated heel Air-Sole unit for great cushioning at impact. ; Full-length Phylon midsole provides lightweight comfort and cushioning. ; Nylon Stoneshield under the forefoot provides extra protection from debris on the trails. ; BRS 1000 carbon rubber under the heel and toe-tip provides maximum abrasion-resistance and durability in these high-wear areas. ; Solid rubber outsole provides durable traction and grip. ; Deep flex grooves extend along the length and width of the outsole to encourage a smooth, neutral and efficient footstrike. ; Aggressive Waffle outsole throughout provides enhanced multi-surface traction and durability, along with a measure of added cushioning. ; 12.00 oz. ; Product measurements were taken using size 9. Please note that measurements may vary by size.