Foam cups are better than plastic when it comes to smoothies, slushes, hot drinks, and more. Look for the perfect lid to meet your needs when you order the 4-ounce foam cups. The slotted cup allows you to be able to use a straw with your lid. The sipper allows for small sips of a hot drink. The vented lid allows your drink to be able to cool off while you work and keeps grime and filth out of the drink!