Vionic Spark Willow Ballet Flat Crystal Covered Blue Removable Insole Support Rubber Soles Size 8 • VIONIC® Advanced Motion System (AMS) technology combines the podiatrist-designed orthotic with a flexible and cushioned outsole for all-day support during work, play, and everyday. • Textile lining keeps feet cool and dry with a removable, textile-lined, EVA footbed. • Flexible and lightweight rubber outsole with patterned tread. No Signs of Wear Super Cute & Comfy!