SOLO® cups and lids are known around the world for meeting high quality standards and providing excellent reliability. Traveler® Sip Through Lids for ThermoGuard® Hot Cups are an excellent choice for busy commuters on the go. Lid allows extra space for froth or whipped cream for gourmet hot beverages. Inner ring reduces pop-off incidents, providing a more secure lid fit and reducing dribble at the rim and cup seam. Made of high-impact polystyrene.