The Rudy Project Rydon Black SLIM with RX prescription clip is unbelievably lightweight in 22grams, it's flexible yet durable and our best selling product for Sports Prescription. Now we have introduced the SLIM version of the Rydon which is perfect for athletes with SMALL & NARROW faces. Therefore support down the track for spare parts, lenses and RX will not be a problem. Features include: adjustable nose piece and temple, E-Lock patented anti-slip nosepiece locking system, prescription ready.