I found these shoe laces at a race expo and tried them out on different shoes and different distances over the weekend. I had no problems at all during the 5k, 10k, or 1/2 Marathon! My feet felt so much better because there were no more pinch-points as my feet swelled during the races. My feet did not slip in the shoes while wearing so no blisters were formed. The ease of just slipping them on and off proved to be valuable as a friend that was with me got her heel stepped on by another runner and her shoe came off...yes this happens when you have 20k+ other runners in an event...she was able to just stop, slip her shoe on and keep on going with no effort!
I needed a black pair to use on my exercise shoes and did a quick search and here they are!  Easy to install and once you have the tension adjusted for your taste...you are done!