Made from 100% recycled polyester, and 100% recycled plastic for the aglet, Oboz’s proprietary Round Shoelaces are offered in five sizes to best fit your shoe needs. The aglet in all sizes is 3mm in diameter. Denser and more rigid, the main benefit of using Round Shoelaces is lace longevity. To ensure they stay tied during your adventures, consider tying a double knot.