• Modern helmet design means that your head is ~1.5 degrees cooler than if you are not wearing a helmet*, and the Kamm tail design means that you are also more aerodynamic with a helmet than without.

    The two things are not both true for any one helmet design. Some road helmets are cooler than bare head, some TT helmets are more aero than bare head. So far, there isn't one which both keeps you cool and makes you faster.

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