Are you an “Optical Nerd”, or know one? The “Optical Nerd” tumbler is great for opticians, lab techs, optometrists, ophthalmologists, and anyone who lives and breathes optical! This whimsical tumbler will be the envy of the office...and why not? Just look at it! And if you need a gift for someone who loves glasses...this is it! And check out the video! It shows the t-shirt with the same design, both would make an awesome gift! This stainless travel-size tumbler is vacuum-insulated and built to last. It's perfect for showing off your style on the road, at the office, or in the countryside. .: Stainless steel .: 20oz (0.59 l) .: Rounded corners .: See-thru plastic lid .: Glossy finish