It’s a two-piece fastener that screws together, but is too large to get back out the lace holes, so you’d be cutting the end knots that are buried in the fastener to remove the laces, which loses length you may need and that cut end is very hard to put back through the lace holes.
Popular enough to sell at Costco. In the Canadian wild, I have only seen them a dozen times or so.
Actual new elastic cording or laces is cheap as dirt. I wouldn’t reuse the lace but you can reuse the metal screw together piece.
Or if you have an aglet machine (it’s like a pliers) you can make new aglets and problem solved.
Aglets are not necessary for the screw together piece but threading laces in the shoe needs an aglet.
Yes, basically the same cost as normal shoelaces. Especially if you buy several pairs.
I put them on all of my shoes, have for at least a decade. Work great.
My only tip is to leave a couple of inches of slack to work with after you get a comfortable fit when you’re putting them onto the shoe, more than you think you need to. Once you cut the ends and lock in the end cap, whatever you’ve left yourself is all you’ve got.
The highest rated ones are these so that’s what I bought
In a similar vein, I bring you the buckleless belt.
Not directly relevant to the no-tie shoelaces, but in my capacity as an Old Fart, shoes and laces have become an increasing challenge.
Summer is no problem – I just slip into a pair of sandals. They have velcro straps but usually I don’t even bother with them!
Winter has been a hassle until I finally bought a pair of oversized fur-lined zippered winter boots. Easy to get in, easy to get out of. Zippering them up is optional. Sorta like winter sandals!
You really need to upgrade to Crocs.
I’m not playing, they are the absolute easiest shoe to wear.
And you can get fur, fuzzy-stuff lined ones. Or do like me and wear socks with yer Crocs. (I won’t tell the Lil’wrekker, she really hates that)
And you won’t need shoestrings, elastic or otherwise.
Once I laced my shoes like this, for kicks:
I have seen people wear these
They were not running a marathon, though.
Also, now that you mention it, you can obviously get slip-on or engineering boots…
Why do you even need a “doohickey”? Is it to adjust the tension?
American Costco stores also sell Skechers shoes but not all the time and usually only one or two styles at a time. For much more selection, I drove to an actual Skechers outlet store or bought them from Amazon. (The first pair I bought in the outlet store because I wanted to test the fit and how well the shoes stayed on.)
I got one of my pairs from Kohls and another from a Skechers store. Even my local big box mega grocery store (Meijer) sells them.
I’ve been using those for years. Different colors available and easily adjusted for the snugness you might prefer.
I find it hard to buy shoes. I may try on a dozen pairs of shoes to find one that fits well. So i shop for shoes and take whatever laces they come with.
Aftermarket elastic laces intrigue me, though. Not that I’ve ever had trouble tying my shoes: that’s the direction I’m flexible in. (On a good day, i can literally put my foot on my mouth, or at least, a couple of toes. On a bad day, i often figuratively put my foot in my mouth, of course…) But it would be faster to change shoes that way, and i wouldn’t need to sit on the floor. Hmmm.
Crocs are great. Nurses found out their advantages before most other people and have been wearing them since they came out. Easy to wash too. Naturally, hospital administrations started complaining about the open holes and the fact people liked them, but then they came out with holeless ones. But you can’t wear them safely to the gym or going jogging.
I think it would have the most utility putting your shoes back on when leaving someone’s home. A lot of people I know have you take your shoes off in their house but don’t have a seat or stool next to their door to make it easy to put shoes back on.
I have various types of non-laced shoes including slip-ons, but all my laced shoes have regular tie laces because I like to be able to adjust the snugness.
You made me laugh, @puzzlegal .
That was hard down funny.
Foot in mouth. Hilarious 
Thx for the giggle.
(BTW, I can stand flat footed and put both hands flat on the floor. Palm down. Straight legs. Kids love it. They call it “folding myself”)
Come on! @DPRK that plaiting shoe string thing is art.
I’m impressed.