Zappos.com is proud to offer the Nunn Bush - Crevasse Sport (Black Nubuck) - Footwear: Keep your feet cool while your walking the hot pavement or traversing the trails. ; Durable synthetic upper with vents for cool comfort. ; Ghillie lacing system with a toggle lock provides a customized fit. ; Ample cushioning and a Comfort Gel heel insert in the footbed. ; Genuine rubber bottom with an aggressive tread pattern. ; Weight: 1 lb 1 oz ; Product measurements were taken using size 9. Please note that measurements may vary by size.