Cycling hat under helmet is not a popular product. Most people prefer to wear helmet only. Actually, there are lots of benefits about the cap you should know. It’s hard to avoid ultraviolet rays when exercising outdoors, not only cycling but running, fishing, climbing etc. This portable cap will prevent you from that. It can be worn alone or under a helmet. The elastic design also makes it more comfortable to wear, and there anti-slip material inside, not easy to slid.