If it works in Memphis - It will work anywhere!!!!!!!
I have used Sweat GUTR, Halo Headbands with strip and Headsweats. All of these resulted in less sweat in the eyes and sunglasses, but in the usual summer Memphis heat and humidity, these were overwhelmed on the worst summer days.
I purchased the Helmet Liner X2 with hook and loop along with the Headband. I have only used the Helmet Liner and it has not allowed sweat to run down the front of my face in either the eyes or sunglasses. I thought I would need both the helmet liner and the headband to accomplish this, but so far - no. I may need to use both as the summer progresses, but I have rode with the Heat Index just under 110 degrees F. Don't know how it does this, the X2 is very slim, not bulky at all.