[barrkel]

Even a quiet helmet, at speed it's like a radio tuned to static turned up to a noise level just below painful. Windshields can actually make it worse, depending on airflow - turbulent air coming over the top and around the sides of the windshield is louder than clean smooth air. Windshields do more for fatigue, weather protection and aerodynamics.

I wear hearing aids due to motorcycle-related hearing loss, and I have never worn anything less than a full helmet.