Lid-up compatible SOLO? cups right tightly with Traveler? drink-thru lids. Long-sleeve, dome design with top-slot ensures a snug fit while providing sip-and-go convenience. Unique inner-catch ring keeps the lid from popping-off if the cup should bend or flex. Fits: 10oz Paper Hot Cups; Material(s): Plastic; Color(s): White; For Use With: Paper Hot Cups.