The MAYRA BIS - WOMEN'S black boot gives a confident yet feminine flair to any look. Crafted with a signature silhouette, these boots will make you stand out from the crowd. Make a statement in these 18" of unique! Based off a Size 7, there is a two inch difference in the circumference in a regular and relaxed fit. Regular shaft opening is a 13.5" and Relaxed Fit is 15.5".