Specifically designed to use with smoothies which are much thicker than liquids, this 8mm diameter straw allows the user to pull through without having to struggle. Naturally the straw is just as at home in any drink and especially where a faster delivery is wanted. There is no argument that excessive use of plastic is doing harm to the environment and plastic straws are one of the culprits so these fully biodegradable straws are a very good answer. They perform as well as plastic but don't stay in landfill for centuries, they simply rot away.