This model combines first-class Prizm lens technology with an excellent frame design. In addition, it has protective side shields and a bridge lock as well as an integrated goggle strap for comfortable wearing. Design: The functional sports design offers optimum comfort and protection and optimises performance in high light intensity. More details: Available with Prizm lenses for improved colour, contrast and detail vision. So you can achieve top performance in all activities. Non-slip: The Unobtainium nose pads and temples provide a secure grip in the event of perspiration, so your glasses fit comfortably and won't slip. Protection: Interchangeable and removable bridge lock and Unobtainium side shields that prevent glare and protect the face. Strap: With the integrated 20-inch long, lightweight, highly flexible, coated steel mesh strap, the Clifden model can be worn on the nose or hung around the neck. This means you don't have to worry so much about your glasses during sport, but can concentrate more on the actual challenges.