Orthotic Comfort Contoured Thongs Flip FlopsThe only contour shaped beach flip flops made so you can be super comfy give your feet a hug. Ergonomic: orthotic design shapes your feet. Made for summer: look great, feel great, with anti slip soles. Measure your foot length while standing: If your size falls between two sizes, order the larger. Order one size larger also if your foot is thick or wide. Size Australia size Heel to toe (cm) 39 40 6. 5 25. 5 41 42 7. 5 26. 5 43 44 8. 5 27. 5 45 46 9+