Saw this promoted on FB this morning:
https://www.thedancesocks.com/Q: What would happen if I just tied a strip of lycra around my sneaker at the ball of the foot? Could I spin on my smooth kitchen floor?
A: YES! It works fine - I could do forward and backward spins.
Because it has more friction than a spin trainer, the turns are slower, which lets the skater stay in control. The skater has to balance more, which is always a good thing. It allows you to put the weight ont he actual ball of your foot, not in the center the way that dance turn boards.
It's a step up from spinning in your socks because the sneakers provide support. Definitely a cheap way to do off-ice spin practice.
You could probably cut the toe off a pair of socks and get the same result.
In fairness, the product they're selling is more refined than my ratty, uneven strip of lycra from my scrap bag. It's also a sock-like material.
Give it a try and let me know what you think!