Minimal Leather Sneakers. EKN interpreted the Bolide- a sleek sports car design; into a sneaker Heel-loop Upper made from vegetable tanned leather Vegetable tanned calfskin lining Two pairs of laces EVA sole made from recycled materials and recycled chloroprene rubber provides responsive cushioning and long-lasting lightness when walking Handmade in Portugal As these sneakers run through unisex sizing, if you need a narrower fitting, we recommend you choosing one size down.