Specialist Vent Crocs are light, comfortable and ergonomic shoes. They have a supportive arch, footbed circulation nubs and are designed to prevent pressure points, ensuring all day comfort. The Croslite material moulds to the feet for a custom fit. The clogs feature a thicker metatarsal area to help protect the top of the foot, closed heel to meet workplace standards and inset side ventilation ports to keep feet cool and protect from spills. Croslite . 270g. Propriety Closed Cell Croslite Resin. Non-Marking Sole.