The most important factor to consider when buying a secondhand beanie is the brand and the quality of the product. If you want to buy a high-quality, branded product, then it is better to avoid buying secondhand beanies. If you are looking for a less expensive brand, then it should be fine to go for secondhand ones. Just make sure that they’re clean and that they don’t small and the threads aren’t falling apart. If they’re okay, then there should be no issue with grabbing that bargain and going for secondhand beanies.