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 forstructured 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.