What is a common feature of caskets used for cremation?

Caskets used for cremation are often lined with fabric as a common feature. This lining serves multiple purposes, such as providing a more aesthetically pleasing appearance and contributing to the overall comfort and dignity of the deceased during the cremation process. Fabric linings can come in a variety of materials and colors, allowing for personalization according to the family's wishes.

When it comes to the other characteristics mentioned, it's important to note that cremation caskets do not have to be made of metal or be waterproof, as these features are not necessary for the cremation process. Additionally, while some caskets may be made from recycled materials, it is not a requirement or a standard feature, making lining with fabric a more defining characteristic of caskets used specifically for cremation.