The covers on offer on the cast iron firepits website. They are made of made of woven polyethylene fabric. They come with brass eyelets for the drawstring in order to tighten around the chimenea to prevent flapping. Moreover they are water resistant and a good way to ensure the chimeneas remain dry.
The main cover is one that is more suitable for wet weather, so is light. They are easy to put on, just pull it over the firepit. However the firepit shouldn’t be hot.
The individual products detail what size they match with, as not all covers are suitable for all model sizes.