Just like the Brooks core line, the PureProject series is held to the industry highest wear-test and durability standards. Because of their lightweight construction and fewer materials, runners should generally expect shoes from the PureProject line to last approximately 250-300 miles. Blending the secure grip of climbing shoes with the comfort of lightweight running shoes, the PureGrit 4 connects you to the terrain and protects from tricky elements. Aggressive hex lugs on the outsole provide maximum grip and the ballistic rock shield protects your foot from all hazards. BioMoGo DNA in the midsole offers adaptive cushioning while staying more flexible. Nav Band wraps your foot for more comfortable security.