Speedo Women's Boom Boot 100% Synthetic Rubber sole Shaft measures approximately 13.75" from arch Boot opening measures approximately 16.25" around SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors) SPEEDO Women's Speedo Booms Boots (4 Colors)