Reach new heights in the Altra Lone Peak 4 Mid RSM (rain, snow, mud) Trail Running Shoes. Part of the All-Weather Series Predecessor: Lone Peak 3/3.5. Support Type: Neutral to underpronation. Cushioning: Moderate. Surface: Trail. Differential: 0 mm. Altra recommends those new to natural running and zero-drop footwear should transition slowly by wearing these on shorter runs and gradually building up to regular mileage. Altra Zero Drop Platform places the heel and forefoot at equal distance from the ground for natural alignment and a low-impact running. Designed to improve running form, toe splay, stability, traction, and comfort. FootShape toebox design allows the foot to splay naturally and maintain proper alignment, while absorbing shock and promoting a more powerful toe-off. Lightweight eVent upper combines waterproof technology and breathability for ultimate comfort and protection. Gusseted tongue helps keep debris out. Lace-up closure. 4-Point Gaiter Trap features a tab to secure gaiter to the shoe without having to strap it below the outsole. Light tongue and collar padding. Breathable fabric lining for a great in-shoe feel. Dual-layer EVA midsole with A-Bound top layer. A-Bound technology is an energy-return compound that sits directly under the foot to reduce ground impact and add spring to each step. Total Stack Height (total thickness of midsole and outsole underfoot): 25 mm. Maxtrac outsole with TrailClaw canted lugs beneath the metatarsals for ultimate gripping in the gnarliest terrain. StoneGuard helps deflect rocks for a smoother, more stable ride. Imported. Measurements: Weight: 10.3 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.