Hello, this issue is very important, we kindly ask you to read it carefully. The products are flexible, but since they are 100% silicone, they definitely do not expand (this product is 100% silicone). It will not cause any discomfort to the skin, but if there is a mark on your wrist, we kindly ask you to remove it immediately. If there is even 1mm gap and it doesn't make marks on your arm/wrist, that is, it doesn't squeeze, then there is no problem, but if it makes marks on your wrist and it squeezes, please try a size larger product. We are waiting to hear from you.