Miracool hard hat pads help you stay cool on hot days! This hard hat pad will keep you cool and also provide excellent sun protection for the back of the neck. Even full brim hard hats dont fully protect the back of your neck, well now an answer is available. All you have to do is just soak your very own hard hat pad with neck shade in cold water for 10-20 minutes and it stays hydrated for several days. Reusable thousands of times. Works without freezing or ice.