about ten years ago at a pro tennis tournament a pro told me to try yonex grip. I have been using it ever since. It's humid down in florida so I need something to help me hold on and this is the best that I have found. I tried everything else and this works for me.
Nearly as good as Wilson but greater color selections.
I have only used Tourna blue overgrips extensively, tried few others as one offs that I didn't like. I really dig this overgrip, while Tourna feels made from paper after they get used, Yonex ones have a better feel and really kind of stay put on your hands without any slippage. Granted, I have not used thes ein hot temperatures yet, over overall these have very comfortable feel, they allow nice grip, not slippery at all, seem to extend the leather feel of my racquets regular grip very well.