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Zappos.com is proud to offer the Nike - Air Alvord 8 (Metallic Silver/Black-Cool Grey-Metallic Silver) - Footwear: If you prefer the rough and rugged terrain over smooth asphalt, then you'll want to run in a pair of these Air Alvord VIII trail running shoes from Nike. ; Features the ideal trail running shoe for the runner who wants a durable, comfortable protective trail shoe designed to withstand the wear and tear of off-road running. Upper features: ; Technical, single-layer mesh enhances ventilation for the perfect blend of breathability and durability. ; Unique heel fit system provides an adaptive fit and enhanced lockdown over the footbed for added support and stability on rough, uneven terrain. ; Strategically placed, durable overlays through the heel and midfoot provided trail-specific support for a snug, secure fit. ; Lace-locking system provides a snug fit and great lockdown over the midsole. ; Gusseted tongue helps keep debris and moisture out. ; Built on a QD-16 last. ; Plush lining for a comfortable fit and feel. Midsole features: ; Encapsulated heel Air-Sole unite provides long-lasting cushioning at impact. ; Full-length Phylon midsole for lightweight comfort and cushioning. ; Nylon Stoneshield under the forefoot gives extra protection from debris on the trails. Outsole features: ; BRS 1000 carbon rubber under the heel and toe-tip provides maximum abrasion-resistance and durability in this high-wear area. ; Solid rubber outsole for 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, durability and added cushioning. ; 13.00 oz. ; Product measurements were taken using size 9. Please note that measurements may vary by size.