EXTRA LARGE SHOULDER COVERS ONLY does not include the DOWN UNDER OUTDOORS saddles VERY HEAVY DUTY these shoulder covers are very durable and more resistant to curling FITS EASILY these fit our EXTRA LARGE saddles, not the small or standard WILL NOT FIT OTHER BRANDS will not fit other brands will not fit other brands SIMPLE INSTALLATION adjust straps then place cover under flap before closing the snaps on the flap Our sets of four EXTRA LARGE shoulder covers are to be used with our EXTRA LARGE saddles only, (not the standard or the small). Sometimes the chickens shoulders will be missing feathers from feather pecking, or an over zealous rooster may literally be wearing off all the feathers on the chickens shoulders, due to excessive mating. This can lead to open wounds and cannibalism within the flock. At the first sign of excessive wear or to prevent issues, the shoulder covers can easily be installed with the EXTRA LARGE saddles. The video in the listing shows how to put the saddles on first and then add the shoulder cover. The cover is installed with the largest side towards the chickens head and the shiny side up. It is placed in position prior to closing the flap. Be careful not to have the cover in the way of the snaps closing. If a cover is lost, or eventually becomes unusable, then just use a replacement from these four packs. If the covers get misshapen, which can easily happen if they are not stored flat, or on some birds they seem to easily become a bit rolled, the covers can be removed and ironed with a hot iron. You must use a piece of cloth on top of the PVC. Be careful not to get it too hot and melt the cover. This will restore any bent up and wrinkled shoulder covers back to their original shape.