SOLO® cups fit tightly with Traveler drink-thru lids. Secure-fit long-sleeve, dome design features a convenient sipper-slot for on-the-go enjoyment. Unique inner-catch ring keeps the lid from popping-off if the cup should bend or flex. Fits: 10 oz to 24 oz Hot Cups; Material Type: Plastic; Material(s): Polystyrene; Color(s): White.