I have read both the previous reviews and the sizing chart which states "IMPORTANT: Fit is half the size of standard US sizing. If you usually wear US size 10, you should order size 9.5. I think this is wrong. I measured my foot at a sporting goods store, compared it to a previous trainer I wear in a US size 4.5 and based on all of that ordered a 4.5. I guarantee a size 4 will not fit my foot. 4.5 was very tight - I feel like I would have to go up to 5.5 to have enough room. They are also heavier than I expected compared to other boxing shoes.