Smart Top reclosable lids make sure beverages stay where they belong. Each lid opens and closes easily. Sliding tab can be moved back and forth with one hand to seal the opening on the go. Lids help prevent spills and leaks. Interlocking design fits securely over inside and outside rims. Lids keep beverages warmer longer. Reclosable mechanism prevents cooling. Lids are designed for use with 12 to 16 oz. cups.