OluKai Men's Na'i Leather WP Waterproof Drop-In Heel Comfort Slip-On Shoe - Size 13 Waterproof Construction: Features a waterproof/breathable membrane and waterproof leather uppers to keep feet dry in wet conditions. Drop-In Heel: Incorporates a versatile "Drop-In Heel" design that allows the shoe to be worn as both a standard slip-on and a slide. Comfort & Support: Includes a removable and washable footbed with anatomical support for all-day comfort. Traction: Built with a non-marking rubber outsole designed for reliable grip on various surfaces I would describe the color as a dark gray, almost black. Excellent preowned condition. Very minimal wear.