Machine Wash Sole material Ethylene Vinyl Acetate, Rubber Outer material Mesh Closure type Pull-On About this item Vionic's active fitness shoes contain Advanced Motion System Technology, providing optimal support, stability and comfort for the woman on the go. ORTHAHEEL TECHNOLOGY - Developed by podiatrist Phillip Vasyli, Orthaheel technology is built into our flat shoes, sandals and slippers to support natural alignment from the ground up. Lightweight, but not on support. Addictive Support: Innovative biomechanical footbed gives your feet orthotic arch support. Deep heel cup for stability. WORN A COUPLE TIMES. Machine Washed.