Dive Socks!
Years ago, while on a dive liveaboard in Australia, there was a lady diver who wore colourful socks inside her dive booties. She said that the socks helped slide both her wetsuit and booties over her feet and legs and also reduced rubbing inside the booties. I thought this was a wonderful idea as my feet were getting quite chewed up from my booties.
On our next dive trip to Bonaire, I found and purchased some dive socks and became an instant advocate of them. I convinced Murray to try them and he quickly became a convert.
I then set out to sew dive socks for all our dive buddies. The wilder the colours the better!