Upper: Vegetable-tanned (chrome-free) leather from Portugal. Small irregularities on the leather's surface and color are characteristic features that make each pair unique. We support our local businesses by purchasing all materials for our shoes from local suppliers. Footbed: Step into comfort with the antimicrobial, contoured Carbon Step™? footbed that provides a pleasant and supportive experience. Outsole: Durable natural rubber that is very flexible and provides good grip – a stable and reliable foundation for every step. By purchasing this product, you support responsible leather manufacturing via the Leather Working Group (LWG). We only use skins and hides that are by-products of the food industry. See our size guide to find the right fit for you.