The covers on offer on the Mexican chimenea 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.
These are split into two groups. One is more suitable for wet weather, so is lighter. While the other is more suitable for cold weather, so has a padded interior to prevent the chimenea clay from freezing.
The individual products detail what size they match with, as not all covers are suitable for all model sizes.