Fit is of course the most important consideration when choosing a cycling cap, though other considerations should be made before purchasing this convenient item. A cycling cap can be worn underneath a helmet to help control sweating, to help retain heat in cooler conditions, to keep one's hair under control, or to simply add an aesthetic touch to the cycling outfit. Traditionally, a cycling cap was worn by cyclists during races before helmets were required, and then as helmets became more common in racing, the caps were worn on climbs only. Today, they are mostly worn for fashion or underneath a helmet.
Choose a cycling cap with a design you like. Some of the cycling cap designs you will see on the market feature loud designs and bright colors, while others will be more subdued. Try to choose a cap you are likely to wear regularly rather than one that looks good at first glance, but is likely to look somewhat strange when you wear it. If you are wearing the cap for fashion only, consider more subdued colors and designs, unless you are a fan of a particular team and want to support them by wearing their team cap.
The construction of a cycling cap often allows for the short, round brim to be flipped upward. This is done to secure the hat more firmly on your head, and the brim can be flipped down to help block sunlight or rain. Make sure the cap you choose has a brim that is sturdy enough for regular movement, and it is the right size for blocking sun or other elements. The fit of the cap should be fairly snug to prevent it from moving during use; if you are wearing only the cap when riding, you can flip the brim upward to prevent the wind from blowing the cap off your head.
It is a good idea to choose a cycling cap made from synthetic materials that will wick moisture and keep it away from the scalp. This will aid in heat retention during cold weather and keep you dry and comfortable in warmer conditions. The cap should feature elastic of some sort for a tighter fit, as it is likely the material will stretch slightly after regular use. Older cycling caps were made of natural materials, particularly wool or cotton, and while these are great for casual wearing, they may not be the best choice for competition.