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™,MaxTrac™, Balanced Cushioning and the FootShape™ toe box. To top off the update, the midsole foam formula has been tweaked just enough to give you a more resilient feel underfoot Weight: 10.5 oz / 298 g Insole: 5 mm Contour Footbed Midsole: Dual Layer EVA / A-Bound™ with StoneGuard™ Outsole: MaxTrac™ Rubber with TrailClaw™ Cushion: Moderate Stack Height: 25 mm Upper: Durable Quick-Dry Air Mesh Like new- only worn a few times