Bob
The fleece ones in regular size do slip…
The fleece ones in regular size do slip around a little as I sleep, so I put on top of it the wool cap of an old G.I. Arctic “Mummy Sleeping Bag”. This covers the entire head and Velcro's around the neck. This keeps it in place well. But it does get a little warm (the cap/bag were supposed to be good down to -30 F.) So I bought the light-weight one (just the band) in the small size and changed over the speakers. This stays in place well, but is just a little too tight, so I’m wearing it in the day to stretch it out a bit. Both great products!

