100% guaranteed to stay-put trainer liners.

[FormerlySpeckledyHen]

Fed up buying liners only to throw away in a matter of minutes because they wriggle down instantly.
Uniqlo were brilliant until they changed them, but not anymore.

Any recommendations please? What do tennis players wear?

I wish I knew, I have the same problem

Years ago I found my holy grail in GAP and bought loads. Sadly they're so worn out now and I dread this search. You buy 50 pairs for only 1 or 2 to work. It's a good question re tennis players!

Sweaty Betty, pricey though

These don’t slip down on me, they have a little ‘sticky’ tab on the inside of the heel.

https://direct.asda.com/george/lingerie/socks/white-no-show-trainer-liner-socks-7-pack/GEM1002625-23619,default,pd.html?clr=White

https://amzn.eu/d/7XjrWPm

Thanks everyone.