Crocs Classic Clogs Unisex Oxygen M12. Slip into your favorite clog and enjoy a custom fit, water-friendly design and ventilated forefoot for breathability. The croslite™ footbed moulds to your foot for a custom fit with excellent arch support. Buy a pair of Crocs™ Classic, the perfect shoe for beach or boat Crocs™ Classic Details: Ventilation ports add breathability and help water and debris drain away. Fully molded Croslite™ material for signature Crocs comfort. Heel strap offers a secure fit. Easy to clean, and quick to dry. Lightweight, non-marking soles.