The Mens Lone Peak 4.0 is a fresh take on Altra's original trail shoe with several significant updates. The new upper will include the same integrated tongue as the previous version but now with static webbing for better cinching ability, a flexible strap overlay for a roomier forefoot fit & a sandpaper textured toe cap. In addition, breathability is enhanced by way of draining mesh in the heel & forefoot & the decoupled nature of the Trail Claw™, as well as multi-directional, carved lugs for improves traction & reduced weight. To top off this already awesome shoe the Stone Guard™ is completely updated to resemble the skeletal structure of a foot for better performance & dynamic flexibility.