To use this cycling cap, simply put it on your head before wearing your helmet. It'll fit right under your helmet and do its job. As for care, you can hand - wash it in cool water with a mild detergent. Don't wring it out too hard. Just gently squeeze out the excess water and let it air - dry. Remember, avoid exposing it to direct sunlight for long periods as it might fade the color. This cap is easy to maintain and will serve you well on many hot - weather rides.