For years I didn't want to use a product like this as I'm a pretty heavy sweater and thought that I'd saturate the fabric and end up being in the same situation with sweat running into my eyes and covering my sunglasses, making things dicey from poor vision. This really helps with that. Granted, I can still manage to sweat through and have some drops in the eye, but it's only during sustained cat 3+ climbs and even when it does drip it's FAR less than it would be otherwise. For regular riding with short-ish burst efforts followed by downhill or flat, the moisture generally tends to migrate back to drier parts of the headband and evaporates at a rate that keeps the sweat from gathering and dripping. So glad I finally relented. Makes the last half of rides less painful!
When I first tried it on, I thought it was a bit tight and warm, but tolerable (I bought the larger size). As I rode, I became used to it and didn't notice it much. What I did notice was there was no sweat dripping down my face. As I began to sweat, the band turned from an insulator into a wick that carried away heat as it evaporated. I've tried other products, and this one works the best with the least discomfort.
I sweat profusely in warm weather and HATE it when my helmet pads fill with sweat/get in my eyes. This headband is absolutely perfect. Fits great, doesn't bother me at all while riding. It wicks the sweat away and then dries fast.
In hot weather (over 80F), my head sweats profusely, overwhelming all caps and other sweatbands. Not this. Itï¿½s lightweight, soft and super-absorbent. I bought a second one for training mid-week then bought the beanie version for days in the mid-90s.
Nice and wide with plenty of coverage to prevent the helmet from contacting your neck and forehead directly. Very comfortable fabric that doesn't squeeze too tight, I got the larger size and this I the only one I want to use under my helmet for warmer rides now.