The RED CAM Round Viewfinder Eyecushion, in yellow fleece, is the standard RED-compatible version from Bluestar. At 2.7" in diameter, it fits the RED DSMC2 OLED EVF eyecup, RED BOMB EVF eyecup, and all similar-sized eyecups from RED and other brands. It's designed to attach to the eyecup easily and stay on securely.
This fleece version is made of 100% synthetic material and provides a high level of softness and comfort for cold weather while enhancing light blockage. The fluffy feel reduces the rate of heat transfer, making the material feel warmer in cold conditions. The RED CAM Round Eyecushion is also known to be compatible with the Canon VIXIA HFG40, XA30, and XA35 camera eyecups, as well as all Panavision and similar eyecups. It also fits the C100/C200/C300/C500 viewfinder that doesn't use a large rubber eyecup.