While these shoe laces are strong, they don't stay tied for too long. This is unfortunately a major issue. The quality of the product is not an issue, but the fact that I need to tie my shoelaces every couple of hours is quite annoying. This doesn't happen with the other shoes I own, which means that it is most likely something to do with this item itself and perhaps less with the way I am tying them.<br /><br />Great customer service, as always from Amazon. I will probably buy some other product as a replacement.