Runners will love the brand new Karhu Fast 6 MRE that provides a plush ride with Maximum Rolling Effect. This model is equipped with a full length Fulcrum unit that helps the runners progress forward smoothly through their gait cycle. A welded midsection secures the foot and an improved external heel counter helps lock the heel in place for a secure fit. Upper: External heel counter for comfortable supportive heel lock. Welded midsection for structured support. Open air mesh with side quarter reinforcements delivers the perfect mix of breathability and support throughout the midfoot. Midsole: Full-length fulcrum comfortably cradles and guides the foot through the gait cycle. Precision engineered compression molded EVA midsole provides a cushioned ride. Outsole: Blown rubber forefoot and compression molded rubber heel.