Product Type: Sandals - Flats, Casual, Open. Product Colour: Grey. Upper Material: Leather. Outsole Material: Man-made. The Rieker 26761-14 Chris 21 mens sandals feature two rip tape straps for an adjustable fit and a neoprene lining for a snug feel. These casual everyday sandals have soft uppers, a lightweight and flexible outer sole, allowing feet to breathe and feel fresh. A summer essential for comfortable wear.