The Aero is all a comfortable, supportive, urban looking boot, with a forgiving mid-stiff flex and fantastic fit due to its asymmetrical design and efficient Boa® Coiler™ lace-path. A Bronze-Level Thermo Heat Moldable liner supplies added hold around the ankles, while helping the level of comfort, and quality of fit. The all-rubber B.F.T Gravity outsole makes it extra-durable.