I am a woman that has a big calf and have had difficulty finding a boot that would fit.  I purchase this and when I tried it on, I found the top material accommodated my calf.  The comfort was wonderful as the 5 stars depict.  I have not worn them for any length of time to determine how well made they are even though they appear to be.  I work with my husband on a farm and have to get in the mud sometimes so they will be given a work out.  If they do not live up to standard, I will change my 5 star rating.  I do believe they will though.  In general, they fell wonderful.