This skull cap does an excellent job of wicking away sweat and keeping it out of your eyes, even on high output rides in humid 95 degree conditions. Airflow through the top is also excellent so no over heating from trapped heat. Its low volume adds virtually no bulk under your helmet and the trim-free design does not leave you with a fossil forehead after your ride. I plan to purchase another one.
After being burned through the helmet I always wear a skullcap. It also helps keep most of the sweat out of my eyes.
Fits well on my big bald head and keeps the sweat off my face while I'm on my trainer. More comfy than using a cap and does a better job then their headband. I've only used it indoors.
Fits perfect, wicks sweat away ,keeps bugs out of your hair, airflow helps cool your head.