I want some of those hidden trainer socks but preferably ones that don’t end up half way down your foot unless you’re pulling them up every two seconds!!
I got 2 pairs of what they call trainer liners from M&S that were part of their activewear range and they’ve been really good. Never slip down as some of the others I’ve bought have. I’m a size 7 foot so often they’ll ping off the back of my heel and start sliding down my foot.