Features:<br> The sliding closure can open and close for direct sipping or for a straw.<br> Come with a black silicone o-ring around the base, which helps cover the cup tightly.<br> Designed with an air hole on top of slider according airflow ergonomics which helps reducing splashing.<br> <br> Specifications:<br> Color: crystal clear with a little blue <br> Material: AS plastic <br> Product diameter: 3.55 inches <br> <br>