Hello Duongchandarapich, thank you for your feedback and sorry about your experience with the size. We offer to our customers as many tools as we can to choose the best matching frames by size, shape and colour: You can find as well all the sizes of our glasses either on each product page or here: https://bit.ly/3z1JzIB. If you want to have a virtual try on, please, check our VTO tool using the webcam on your computer or with your smartphone here: https://barnerbrand.com/pages/virtual-try-on If you choose your Pupillary distance (or the standard Woman/Man) the VTO will show you the true fit as it will be in reality according to your face size / distance between the eyes. But the colors are approximate and we advice to check the photos on the product page. You can also use any of our Instagram filters on your smartphone in our account www.instagram.com/barnerbrand in the highlight folder "Filters". This is an Instagram filter and it could be not 100% accurate in terms of sizing and color, but it can help you to have an idea. Here is a guide on how to choose the best frames for the different face shapes: https://barnerbrand.com/pages/which-glasses-fit-my-face We are very sorry that those tips above did not help to select the proper size and you had to return the glasses. You still can consider applying our simple 30-day Return policy! Let us know if you have any further questions, Kind regards.