I''m easily confused, so at first glance, the installation instructions seemed rather weak, but after lacing one shoe incorrectly, I was able to identify the error and get both shoes laced properly.

used in a triathlon
good working- put about 10 race miles into them with no problems

I use these for my running shoes for triathlon. They work great. They make it so much easier to get into my shoes when I am transitioning from my bike to my run. With regular laces, they are too tight and even when you loosen them, your feet are wet, so it makes it hard to get your feet in. But with these elastic laces, even with wet feet, getting your feet into the shoes is no problem.

I use this lace before and buy another pair for my new shoes, they don't come any better, this sure lace are good for fast transition and make you feel more comfortable than regular lace because it grab your foot to fit. Recommended.

I found these to be overall useful, but don't try to drink a beer or anything before attempting to get these set up in your shoes. Make sure to keep track of the tiny printed instruction card, too.  You will need all your wits about you.  Admittedly, I am not a mechanical genius, but I found the directions lengthy and I don't believe I have the laces installed fully to the optimal level, but they are good enough for easily taking my shoes on and off, and that's what counts, right?

not very easy to work with with smaller shoes