Bolle Bumpy Goggles Flow-Tech venting is an engineered venting system in each frame that promotes directional airflow inside the surface of the lens reducing moisture P80+ Anti Fog disperses water molecules across the surface of the inner lens, restricting moisture build up that can impede a clear view Carbo-Glas provides a protective armor to help prevent scratches keeping your lenses clear Double Layer Face Foam is a medium foam that backs up a soft micro-fleece face layer Fits small/medium