Why use a cover for tea?
☕️ All medicinal herbs contain volatile oils which give them their medicinal properties. When you steep tea without covering the cup or using a teapot, the volatile oils will escape in the steam, rendering the herbal tea less functional. 
Otherwise you’ll just be drinking tasty hot water 
🌱 EASY LIFE: Seals tight on all smooth, prevent from dust, airtight and leak proof, keep your coffee or tea hot
🌱HEALTHY MATERIALS: All Silicone Cup Lids are made of food grade silicone. No small, durable and reusable. Simply wash it with your hands or throw it into the dishwasher.
DIMENSION: 4.1 inch; TEMPERATURE: -40~480 F