Nice product...keeps the sweat from rolling down my face, and easy under helmet. Every cyclist should have one.

This is by far the best helmet skull cap I have used.  Super thin (didnt even have to adjust my helmet) and works excellent.  Have used on super humid long rides and not once did I have sweat in my eyes.  Can't say my head felt "cooler" but it did keep the sweat out of my eyes and definately didn't make me feel warmer.