GoGo over-the-knee boots with 3-inch (7.6cm) block heel, Black or White patent, full-length inside zipper closure. women's large size boots Sizes 5 to 16. PS-GOGO-3000 

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The measurements below are for an American Women's Size 7. You will see a plus measurement after each, add this for each size above size 7... EXAMPLE: If calf circumference for size-7 is 15.75...add .4 inches each size larger, then for size 10, add 3 x .4=1.2 inches...so Size 10 calf circ.=APPROX. 16.95 inches...and so on. 

Approximate Circumference For GOGO-3000 size-7
calf circ.=13.37 inches...add .25 inches each size larger
thigh circ.=17.37 inches...add .37 inches each size larger
shaft hgt=22.87 inches...add .37 inches each size larger 

Circumference Measurements are approx. / Use these sizes to estimate your size... 
Size 7... Calf=13.4 inches ...Thigh=17.4 inches 
Size 10... Calf=14.5 inches ...Thigh=18.5 inches 
Size 13... Calf=15.6 inches ...Thigh=19.6 inches 
Size 16... Calf=16.7 inches ...Thigh=20.7 inches

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