The Pat Saunders drinking straws contain one-way valve so liquid stays in straw even if straw is moved from the users lips. They are suitable for people who are not able to suck strongly and prevents air being sucked into user’s stomach which can cause pain and discomfort. The straws clip easily onto glasses and cups and can be washed in normal washing solutions or sterilised with boiling water. Not dishwasher safe. Not suitable for thick fluids.