All the thumb rests I have ever seen (before this mug) were on the top of the handel before it joins the body of the mug. Gives you a nice place to park your thumb and so that the mug does not slip. This one seems to be a stop or something; your thumb just butts up against it. Just saying.........
FROM THE MADE IN WASHINGTON TEAM:
Joyce, Thank you for taking the time to review this product and for giving us your feedback on your Storm Mug. With every purchase you make on our website, if it doesn’t meet your expectations, we have a very generous return/refund policy and are always willing to do what we can to make it right with a refund or a replacement with a different item. You can find those details on our website at: https://madeinwashington.com/policies/refund-policy