The new updated flats boot is of course based on Orvis's long-standing and best-selling Christmas Island Flats Boot. Made of Airprene and vulcanized rubber. The Airprene upper allows water to flow freely through the boot, but keeps sand and grit out. Easy on-and-off with a YKK® side zipper secured at the top by a hook-and-loop tab to prevent line snags. The sole and sidewall are a heavy-duty ridged rubber to protect against coral abrasion and offer excellent stability, but is much more flexible than its predecessor for comfort and "feel" on uneven surfaces. Comes with a reusable mesh carry bag. In gray/multi. Airprene and rubber. Flush with fresh water.