The thick rubber soles of the Avi-Union have an oil and slip resistant tread pattern for enhanced grip, specifically designed to prevent trapping of oil and liquid, and to be non-marking. They help to secure sure footing in slippery environments like food service areas. These comfortable shoes are perfect for people who are on their feet all day. Waitresses, waiters, nurses, & other professionals who are standing and walking all day will love these lightweight, all-day comfort shoes. They're also great walking shoes for travel. Avia's memory foam responds to the unique curves of your foot to reduce pressure points for a personalized fit. The compression molded Ethylene Vinyl Acetate midsole, anatomical heel cradle, and Avia’s Cantilever Technology center and stabilize the heel, and provide exceptional shock absorption and cushioning.