The type of sandals I love and used a lot especially at our European port and cities tours where Four Way Sandals put out by Aerosoles. On sale for about $25-30 and they come in many colors, but black will work best. I have found them in JC Penny, Sears, and most good department stores like Macy's, Filene's etc. There are four wide straps that cross the front with a solid back. The soles are rubber and the innersole is padded. They are open for air circulation but the toe and heel are partially covered. They look nice in slacks, shorts or even a jumper. These are for women. I have bought them for my married daughter and my elderly mother who really like them a lot. Good Luck. They should be on the store shelves before your European cruise.