The updated version of Altra's original trail shoe features a trimmed down layer that offers added flexibility and comfort and a simplified lacing system for improved micro-adjustment. Like all previous versions, the Lone Peak 4.5 includes all of the Altra trail shoe must-haves like StoneGuard(TM), MaxTrac(TM), Balanced Cushioning and the FootShape(TM) toe box. To top off the update, the midsole foam formula has been tweaked just enough to give you a more resilient feel underfoot. Features: - Balanced Cushioning: Places your heel and forefoot the same distance from the ground to encourage proper, low-impact form throughout your trail run - Footshape(TM) Toe Box: Allows your toes to relax and spread out naturally for more comfort and stability in uphill climbs and downhill descents - Gaitertrap(TM): Hook-and-loop tab allows strapless gaiter attachment that prevents debris from building up beneath the shoe - Trailclaw(TM): Canted lugs positioned strategically beneath the metatarsals to provide traction at toe off - MaxTrac(TM): A perfect combination of grip, traction and durability that will eat up gnarly terrain like a boss - Weight: 10.5 oz / 298 g - Insole: 5 mm Contour Footbed - Midsole: Dual Layer EVA / A-Bound(TM) with StoneGuard(TM) - Outsole: MaxTrac(TM) Rubber with TrailClaw(TM) - Cushion: Moderate - Stack Height: 25 mm - Upper: Durable Quick-Dry Air Mesh