The lenscoat travelhood large in forest green is a lightweight alternative or replacement to the rigid lens hood that comes with your lens designed for use with 400mm f28 600mm f4 and 800mm f56 lenses the ribbed design allows it to fold nearly flat to easily store in your gear bag or suitcase making this hood your perfect long lens companion made from lightweight water resistant material the lenscoat travelhood deflects stray light to prevent glare and lens flare the lenscoat travelhood