Vionic Sky Storm - Women's Active Sneaker. Get a serious boost with Sky Storm, a high-tech active lace-up featuring a combination of highly-flexible patterns and a rubber sole for buoyant movement. Contoured footbed for addictive support. Orthaheel technology helps promote alignment from the ground up. Deep heel cup provides essential stability. Stylish and comfortable footwear that incorporates a podiatrist designed biomechanical orthotic.