Merrell Moab FST Mid A/C WP Boot Kids The new Moab FST for kids delivers on all day wear with excellent breathability and waterproofing with added support in a classic looking hiking silhouette. Upper: Synthetic and breathable mesh with waterproof lining Lining: Breathable Mesh Midsole: EVA Outsole: M:Select Grip Rubber Closure: Bungee Cord