The Smith Reason OTG goggles are over-the-glasses and optical docking station compatible (ODS). In other words, you can wear them over your prescription glasses or use Smith's ODS prescription lens insert to maintain the sharpest vision possible. Designed with larger face shapes in mind, they provide a helmet-compatible, pressure-free fit that lets your glasses sit naturally for comfort that lasts all day. The ventilated design regulates airflow for a fog-free view even when wearing a helmet.