I faced the issue while buying shoe online. There are startups shoe company which manily sell online. Moreover, online prices are lesser in general compared to store. But fitting of shoe is a concern. This article tries to address this condition.
Size number differs. UK and US sizes too are different. If you don't know your shoe size, you can measure your feet and use size chart to get the size at home. Other way, you can visit your nearby shop and check the size with them
Wear the type of socks you'll wear with your shoes and measure feet in the afternoon (feet typically swell during the day). Distribute weight evenly before measuring.
STEP 1
Stand up straight on a hard surface with your heel against the wall and a piece of blank paper taped to the floor, flush against the wall beneath your foot.
STEP 2
Have someone mark the longest part of your foot (referred to as heel-to-toe length) on the paper with a pen or pencil, or measure yourself if necessary. Repeat with the other foot, as right and left sizes may be different.
STEP 3
Use a ruler to measure the heel-to-toe length you marked for each foot.
Use your measurements and the chart below to determine your shoe size.
Please note: your heel-to-toe measurement (cm) will be slightly shorter than the CM measurement on your shoe box.
http://www.nike.com/in/en_gb/c/size-fit-guide/mens-shoe-sizing-chart?ref=https%253A%252F%252Fwww.google.co.in%252F
http://www.adidas.com/us/help-section-size_charts.html