Convenient lids form the perfect complement to Vio? foam cup selection; for easy sipping on the go. Vio? lids have been shown to biodegrade 35% after 1087 days under conditions that simulate a wetter; biologically active landfill; using the ASTM D5511-11 test. Note that stated rate and extent of degradation do not mean the product will continue to decompose. Sturdy lids provide a tight seal perfect for toting along your favorite coffee; tea or soda.