In reality, a lot of shoppers return products to the online store because of the sizing issue.
A size chart describes graphically what is measured and gives the measurement for different product sizes. By using this feature, a size chart popup will appear once buyers click on the size chart button. Then, they can easily measure what is the suitable size for them. Moreover, you can upload a different size chart image for each product. It is particularly useful if you sell various product types such as clothes, shoes, etc.