It may seem like a stroller rain cover isn’t safe because it restricts airflow to your child. However, all rain covers have some sort of ventilation on the sides. Some are better than others, so it’s always best to make sure you choose a cover with large mesh panels or ventilation holes, even if it means a little water might make it into the stroller. While some covers do offer UV and sun protection, it’s still not recommended to use them in extremely hot weather, as it can increase the temperature inside the stroller.