Zappos.com is proud to offer the Avia - A5657M (Black/Steel Grey/Silver) - Footwear: Let the reliable responsiveness of the Avia A5657M carry you mile after mile from training through race day! ; A neutral training flat. ; Breathable mesh upper. ; Supportive synthetic overlays. ; Lightly padded tongue and collar for added comfort and performance. ; Molded EVA insole offers great step-in comfort and can be removed to accommodate an orthotic. ; Molded EVA midsole, with Avi-Release technology, provides plush and springy cushioning. ; TPU shank offers light support. ; Solid rubber outsole supplies durable traction. ; Flex grooves allow the foot to move more naturally through the gait cycle. ; Weight: 11 oz ; Product measurements were taken using size 11. Please note that measurements may vary by size.