Arc'teryx Norvan LD 4 Shoe Men's Size:10.5 Sternum Straps: Adjustable sternum strap our 4D Brow Cooling Sternum Straps: Adjustable sternum strap with self tensioning elastic and whistle Flex panels make it bendy and flexible bite on soft trails 45C dual density midsole material and construction combine cushioning with lasting shock absorption and support Flexible external frame wraps the midfoot for a secure hold that prevents forward slide and toe bang 25:19 stack 6mm drop PROTECTION Two woven PFAS free upper materials are mapped to combine flex and breathability with targeted abrasion resistance Flexible laminated TPU reinforcement zones add protection and abrasion resistance and won’t absorb water Knit tongue reduces bulk and improves breathability RIDE Vibram® Megagrip outsole with LITEBASE technology delivers durability and enhanced grip across a range of conditions while shedding every gram possible Mud releasing custom 4mm lug pattern provides grip on hardpack