The TYR Swimple Mirrored Goggle is TYR's most comfortable goggle, featuring speed adjust and unibody Durafit Silicone. Durafit Silicone Gaskets: Durable and hypoallergenic silicone gaskets that provide a comfortable, watertight seal and maintain their shape over time. Speed adjustment: Simple and secure release button allows for quick and easy strap adjustment. Unibody design accommodates various facial types. Anti-fog coating. Highly reflective. Maintains shape over time. Comfortable, watertight seal.