Herringbone Strap Block Heel Sandals in BlueLOST IN ECHO Herringbone Strap Block Heel Sandals in Blue The sole with water flow patterns is like stepping on ripples in the water. The metal parts and hollow details of natural elements wrap the instep casually, just like water flowing over the instep. Although the gray blue Gretel is gorgeous and shiny, this color can actually be paired with anything, such as jeans.