Rafters Womens Willamette Water Booties 100% Manmade Imported Synthetic sole Shaft measures approximately 5" from arch Boot opening measures approximately 7.5" around Front Velcro closure adjustment for the perfect fit. Non-slip outsole for stability on slippery surfaces. Snug to the foot for a performance fit. Solid bottom protects feet from rocks or other unstable surfaces. Convenient pull tabs, front and back, for easy on.