Gum Rubber sole DRY FEET FOR MILES Lightweight material has a water-repellent finish to help keep your feet dry in wet weather. Sealed seams help keep water out. TRACTION IN WET WEATHER Outsole design has grooves to quickly help shed water for optimal traction. Sticky rubber helps provide grip. LIGHTWEIGHT, SECURE FEEL Mesh material wraps your foot in sock-like, breathable comfort. The traditional laces are super easy to adjust so you can personalize your fit.