When I tried this product, I was impressed with the clear non-polarized replacement earsocks. They fit perfectly on my sunglasses and added a layer of comfort to my daily wear. The pros of these earsocks are their durable material and easy installation. The only con I can think of is that they might not fit some sunglasses BRANDS and styles .Overall, I highly recommend these replacement earsocks as a necessary accessory for sunglass wearers..