Firstly, TIFOSI customer service is exceptional. Ordered a pair of RAIL sunglasses + the RX adapter/lenses. Submitted my prescription + PD details. Since my order was RX, I was expecting to wait at least 2 weeks. Received the sunglasses in less than a week, and received the prescription lenses the day after. I am amazed. Faster service than any RX provider I have ever tried online or in-store. The RAIL sunglasses + the RX adapter are really lightweight and fit snug so that when I cycle or run, I barely notice they are there. I have been an Oakley bigot for decades and only just recently stumbled upon TIFOSI because they could handle my odd RX, Oakley couldn’t. I am totally impressed by TIFOSI. Price, quality and service – TIFOSI beat the competitors hands down. I will definitely be back for more.