Many types of materials can be used to cover hay, according to the user's needs. Particularly effective options include specialized hay covers, which are typically made from durable polyethylene or polypropylene and are designed to resist water, UV rays, and tearing.
Some farmers use breathable fabrics, such as woven polypropylene, which allow air circulation while still protecting against rain and snow. Specialized hay covers or blankets, made from heavy-duty, weather-resistant materials, are designed specifically for long-term hay storage.