UK sizing This model is also suitable for beginners and those who don't run all that often: the relatively large heel to toe drop helps project your power forwards. - The Mizuno Enerzy midsole offers a great combination of shock absorption and energy recovery - Mizuno Wave foam in the midsole structure provides suitable support for the shoe - Base thickness at the front: 23 mm, base thickness at the rear 35 mm, drop 12 mm - Durable outsole made of X10 alloy - * Mizuno ratings: * - Shock absorption: 3/5 - Speed: 2/5 - Support: 2/5 On the Mizuno scale, speed refers to how fast of a running pace the shoe is made to work for - not how hard it "enables you run". The support tells you how much support the shoe provides to a overpronating foot.