Pro Mesh exterior is constructed from RoHS/REACH compliant German quality BASF TPU, injected directly into breathable mesh fabric; Shaped Fetlock Area improves fit and features increased hardness and thickness to provide extra protection to the fetlock area; Pebax strike guard is lightweight and extremely durable; Honeycomb hex pattern is the strongest natural shape and maximizes airflow; Made with materials that will not become heavy and waterlogged, keeping the boot lightweight and ideal for cross country use