I lo e the look out of the box true to.the pics of bright stars and stripes. The fit is snug but not uncomfortable for a bigheaded man like me its light weight and tagless except for a small on that would bother no one. Looking forward to trying when hot and sweaty in the summer

I wear a size 7 cap, and the Mission Enduracool liner fits my old, bald head comfortably snug. I wear it under my cap, when I'm hiking in hot weather, and under my helmet, when riding my cross-country bike.

The liner does a better job keeping the sweat out of my eyes, than it does keeping my head cool. Taking it off and shaking the sweat out, before putting it back on does cool it down quite a bit, but it only stays cool for a few minutes.

Even though this liner doesn't stay cool for very long, I gave it four stars anyway. Just the fact that the sweat stays out of my eyes longer with the liner on than without it, it feel deserves four stars. Also, it fits comfortably under a cap or a helmet.

I own two of these. Too expensive but they work great as a ski helmet liner. My daughter has long hair and it is all over the place without this. I use it as a sweat absorbent layer--important for warmer weather / intense days. I use a thicker one (different brand) or balaclava for extreme cold. The liner is light and easy to clean.

If your head is REEEALLLY small, this should work great. I have an average size head and no hair to to take up extra space. This thing is so tight it's quite uncomfortable and feels like it's cutting off circulation. Whether it's just sized for people at a scale of 0.8:1 or whether there is a manufacturing issue, I don't know. Or it would work for kids.

Great cooling caps use it to soak up some sweat then wring and shake or pop it to cool down or in cooler weather just as a thin warming cap.