These are my new favorite things. I hate tieing my shoes (yes, I CAN tie my shoes, I just don't LIKE to), but I also own a lot of sneakers that can't be worn laceless, so I'm always on the lookout for ways to turn my sneaks into slip-ons. These laces are flat (not round) and actually pretty stretchy. When you purchase a pair, you're sent a link to a YouTube video that walks you through installation. You could probably get away without the video, but its helpful and worth the 3-4 minute watch. The laces are adjustable, but only once, as adjusting really means cutting the excess off. But, as the video mentions, you can wear them for awhile before cutting them to make sure you've found the proper length. A ton of cute colors to choose from, and the colors labeled "reflective" have an iridescent tint to them. So far I've only used these on casual sneakers, but I intend to install a pair on my running shoes, as they feel like they'll hold up just fine. Plan to keep buying these until I stop wearing shoes.