Probably ROLANPRO Waterproof Lens Cover compatible with Canon RF 200-800mm F6.3-9 IS USM. I obtained this from a used camera, so I'm saying "probably" as I haven't actually attached it. Please check the photos. I think a part for when the zoom is extended is missing. - Brand: ROLANPRO - Type: Zoom Lens - Function Ring: Rotates independently - Lens Hood: Can be stored reversed - Camouflage Design: Design that blends into the natural environment Easy to attach and detach: Sleeve type for quick attachment and removal. Smooth access to buttons and dials, without compromising operability or shooting efficiency. Camouflage color for high concealment: Disrupts the outline of the lens outdoors, reducing the subject's wariness. Waterproof rubber cap x camouflage pattern further enhances the blind effect. Full protection & tight fit: Guards against sand, dust, water droplets, impact, and scratches. The tight design prevents slippage, and provides a comfortable, integrated feel after installation. Two-layer structure for waterproofing and stain resistance: Surface: Waterproof Oxford/twill fabric. Inside: Non-slip PU + soft brushed lining. Balances cushioning and waterproofing. Safe materials, no odor, safe to use. Lightweight design & notes on use: Lightweight and easy to carry. It's a bit tight when attaching to ensure a secure fit, but it fits stably after installation. Due to the split structure, the use of an integrated rain cover is recommended for long periods of shooting in rainy weather. Thank you for viewing.