Brooks Men's PureFlow 5 fabric Rounded Heel: Provides better alignment and minimizes stress on joints No-Sew Overlays: Gives ultimate comfort Wraparound Collar: Lends an ultra plush feel Hyper-Flexible Midsole: Provides a more connected feel BioMoGo DNA LT 10% lighter formula: Offers a barely-there, closet-to-the ground feel with the perfect amount of cushion