How to use: Just put the cap on your head before you start cycling. It's a one - size - fits - most kind of cap, so it should sit comfortably.
Things to note: Although it's designed for cycling, you can wear it casually too. But be careful not to stretch it too hard as it may lose its shape.
Maintenance: You can hand - wash it in cold water with a mild detergent. Don't wring it out; just gently press out the water. Then let it air dry flat. This way, it'll last you a long time and keep performing great.