Muk Luks Women's Miranda Boot Synthetic Shaft measures approximately 18 from arch Boot opening measures approximately 15.5 around Sizing: Women Features: Cushioned Insole, Flexible Outsole Shoe Details: Decorative Buttons, Decorative Embroidery Upper Material: Acrylic Outsole Material: EVA ( 100 &#37;) Insole Material: Man-Made Materials Sole Style: Flat Sole Closure Style: Slip-On Platform Sole Height: Approximately .75" Toe Style: Round Toe