Getting right to it, the pull-tab design is total junk.  As many others have experienced, the loop and top ring ripped off while gently pulling them on.  They had only been worn 10-12 times.  Muck Boot says they only offer a warranty on products purchased from their website.  Muck Boots says they are "so sorry, they'd really like to help me", but then claim they can't because I purchased them via Amazon.  So, terrible design/quality AND poor customer service.  I will not buy a Muck Boot product again.

(Also, the claim that these are rated to -40 is terribly inaccurate)