I have the RF-1200 Beacon in Med, and it always felt so tight, sometimes would give me headaches, and scraped cheeks. I ordered this item in 5mm, in addition to the Shoei cheek replacement pads in 31mm, and it made a huge difference! My helmet is super comfy now! Pricy, but worth the investment. I would buy in a heartbeat again.
Also, STG has super fast delivery, and excellent customer service, so buying from them was a no-brainer!