100% PolyesterDURABLE FLAT SHOE LACES: High quality laces that will outlast your shoesFOR MOST SHOE TYPES: Perfect for sneakers, running shoes, athletic shoes, casual shoes, high-tops, kids shoes & boots. 5/16 inch WidePERFECT FIT: Choose between five lengths (27 inch, 36 inch, 45 inch, 54 inch, 63 inch). The best way to find the right length is to measure the shoelaces you are replacing. You can also refer to our size chart in our imagesPERFECT MATCH: Choose between four colors to match your shoes (Black, White, Gray and Brown)COMFORT: Soft shoe strings with with a fine texture to maximize comfort and keep your shoes tied all day, every day