Sigg Miracle Mug Top Replacement Lid - leak-proof lid for Miracle coffee mugs. Whether as a replacement for a broken cap or to give the bottle a twist: the Sigg Miracle Top Black lid is the perfect replacement for the Miracle coffee to go cup. With its hygienic twist closure, the to-go coffee mug is leak-proof, as liquid can only escape with the push of a button. Additionally, the lid is dishwasher safe. The screw cap contains no harmful substances, including phthalates or estrogen-active substances.