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Disposable rain shoe covers are typically made from waterproof materials such as:

1. Polyethylene (PE) – A common material used for disposable shoe covers due to its lightweight, waterproof properties. It effectively protects shoes from water, mud, and dirt.
2. EVA (Ethylene Vinyl Acetate) – A more flexible and durable plastic material that also provides waterproofing. It’s softer and more comfortable compared to PE.
3. Polypropylene (PP) – Another material used for disposable shoe covers, which is lightweight and water-resistant, though not as durable as PE or EVA in heavy rain.

As for full protection in heavy rain, disposable rain shoe covers are generally effective in protecting shoes from light to moderate rain. However, for heavy rain, their performance might be limited depending on the material and design. Thinner covers may start to leak after extended exposure to heavy downpours. For the best protection in more extreme conditions, look for thicker, more durable covers, or consider using reinforced covers with added layers to enhance water resistance. Some models may also include non-slip soles to provide added safety in wet environments.