The cooler sling is typically made of neoprene, which helps to keep drinks cold for longer periods of time. It is also lightweight and compact, making it easy to take with you on the go. Promotional companies often use 6-pack can cooler slings as a marketing tool to promote their brand. They can be customized with logos or slogans and given away as gifts to customers or employees. This helps to create brand awareness and increase visibility for the company.