Product Review

Feature:

The closure can open and close for direct sipping or for a straw. 
Come with a black silicone o-ring around the base, which helps cover the cup tightly. 
Designed with an air hole on top of slider according airflow ergonomics which helps reducing splashing. 
Keep your drinks cool or hot for a longer time

Specifications: 

Color: Crystal clear with black
Material: AS plastic
  Product diameter: 3.5 inches

Notice: 

It is easy to clean and dishwasher safe, but avoid using in microwave. 
The air hole is designed to keep a same air pressure inside and outside the tumbler, making it convenient for you to drink water. 
This lid will help with accidental tips and spills but not guarantee no leaks if inverted for a long time. 

Package includes: 

2* Spill proof and splash resistant tumbler lids