Measure the length of the foot and the length of the leg from the sole of the foot to behind the knee.
Please use a Tailors Tape Measure to take measurements.
Air Shield Walker fits left or right foot.
Small - max foot length: 25cm, UK shoe size: 3-7 (Euro shoe size: 36-40) Boot Length: 16.5in
Medium - max foot length: 28cm, UK shoe size: 7-10 (Euro shoe size: 40-44) Boot Length: 17.5in
Large - max foot length: 30cm, UK shoe size: 10-13.5 (Euro shoe size: 44-47) Boot Length: 18.5in
If you are between sizes choose the bigger size for the best fit.