Versatile exercise staple
I recently purchased 3 more of these to add to the two I already had. (Lost one so I needed more) I have been using these for years and they are fantastic. I use them as a little protection under my bike helmet and to keep sweat out when it is hot. They go with me on every mountain I climb as insulation in the cold mornings and stop sweat from blinding me as I get warmed up. This summer I was having issues working out in the 90+ deg heat till I started wearing one of these to keep sweat out of my eyes. Can't recommend them enough and all the different colors are fun.
Only got a chance to use it twice so far, and only one of the days was truly hot, but it has done its job so far. No sweat was dripping down into my sunglasses or on my face during rides. I was a little concerned about how it would feel under the bike helmet, but it fit fine after a slight loosening of the helmet. I did notice a "feeling" of something on my brow during the ride, which wasn't good or bad but was certainly preferable to sweat streaming down into my eyes.
I normally wear a 7&5/8 or 7&3/4 for a fitted baseball cap, or an XL at least for most headwear, and this "normal" skull cap fit comfortably just above the ears for me. Great product and I am very happy so far!