Flexible and Frame-less Design Frame- The newest frame-less design for cycling glasses which make cycling sunglasses becoming more stylish and lightweight. The glasses leg is made of rubber which is flexible and comfortable. Interchangeable Rubber Nose Pad- There is an interchangeable rubber nose pad on baseball sunglasses. You can choose the nose pad according to your nose. It will more comfortable because it is made of high quality and lightweight rubber. Ventilation System- The Sports Sunglasses have an excellent ventilation system with vents on the lenses and legs. This ventilation system not only prevents the lenses from fogging up, but also makes them more breathable when worn. Anti Slip Design- The legs of the polarized sunglasses are made of non-slip rubber, which makes it harder to fall off during exercise. However, during strenuous exercise, we recommend that you wear the anti-slip cord that comes with your sunglasses.