Women's Bionic II Boots BlackOur Legacy Bionic II Boots Malleable Black Bull Hide Produced in Italian bull leather, our sneaker boot features a contrast panel construction, a Vibram outsole, and a displaced zipper closure. The back shaft is knitted in a dense elastic yarn to hug the calf, complemented by a strap with snap closure and a shaft that rises to below the knee. Leather Upper Contrast Panel Construction Zip and Snap Button Closure Knitted Elastic Back Panel Below Knee