Be ready to roll through each and every run with the KARHU Ikoni 2.5. Whether you are running on the road or treadmill, the Ikoni 2.5 will keep you moving forward towards your goals. There is a propulsion unit and stable Fulcrum that acts like a lever to move you forward, giving you a nice rolling sensation. It has an accommodating shape and lightweight design, thanks in part to being shaped by millions of fitid® scans from Fleet Feet. Features Upper: improved IdealKnit mesh gives you structure and security throughout the midfoot with a lightweight and accommodating fit. Midsole: The AeroFoam midsole material, combined with stable Fulcrum and enhanced propulsion unit, give you a smooth and balanced ride, perfect for everyday miles.