FOOTWEAR FOR GROUNDED WORKOUTS Tread Collection Get every ounce out of your workout with the world's lightest barefoot training shoe. Available in both a low and hybrid style. Made in the U.S.A. Waterproof Rubber Bottom: Allows for training and traction on all surfaces both indoor and out. Zero-Drop for Natural Foot Position: Makes for an anatomically safer and more effective workout. Wool and Nylon Blend: Provides extreme comfort, moisture management, and durability. Silver Lining: Eliminates odor and bacteria at the source. Weighs only 4oz: Can fit in your pocket if need be! Machine washable: Wash cold and hang dry. Form Fitting: Product will stretch to form fit to your feet as you continue to wash and wear them. *DISCLAIMER: This sole is made of a natural rubber latex. Should you have an allergy to latex, make sure to wear a liner sock to act as a barrier between your skin and the latex.