It is important to make sure the ankle brace/guard fits snugly without being too tight. Laces give you the ability to adjust the boot sleeve to the contour of your foot. Then the figure 8 straps lock in your ankle in conjunction with the boot to give you the support you need to play sport. The collar straps will stretch around the top of the brace to complete securing the figure 8 straps.
When determining what size you need the best way is to measure you ankle as shown below. Shoe size is another way to measure but not as accurate as foot width and length vary. Although the ankle brace/guard is slimline there is a little extra bulk which could cause the shoe to be a little tighter if the shoe is already tight.
Size XS (Extra Small) Fits
-Australia 4.5 to 6 Mens or 5.5 to 7 Womens
-USA 5.5 to 7 Men's or 4.5 to 6 Women's
-UK 4.5 to 6 Men's and Women's
Size S (Small) Fits
-Australia 6.5 to 8 mens or 7.5 to 9 Womens
-USA 7.5 to 9 Men's or 6.5 to 8 Women's
-UK 6.5 to 8 Men's and Women's
Size M (Medium) Fits
-Australia 8.5 to 10 Mens or 9.5 to 11 Womens
-USA 9.5 to 11 Men's or 8.5 to 10 Women's
-UK 8.5 to 10 Men's and Women's
Size L (Large) Fits
-Australia 10.5 to 12 Mens or 11.5 to 13 Womens
-USA 11.5 to 13 Men's or 10.5 to 12 Women's
-UK 10.5 to 12 Men's and Women's
Size XL (Extra Large) Fits
-Australia 12.5 to 14 Mens
-USA 13.5 to 15 Men's
-UK 12.5 to 14 Men's
By MEASURING THE ANKLE
Ankle Radius Measurement
X Small 25.5 - 28cm Small 28 - 30.5cm
Medium 30.5 - 33cm
Large 33 - 35.5cm
XLarge 35.5 - 38cm