I own farm prop. w/ cattle in MO (muddy and cold) and I have been waiting to get these boots for myself for a while.  I normally wear a mans size 10 (my first order, returned) I finally ended up getting a size 11 M.  They do feel like they will hold up many years of muddy work come.  As always Amazon Prime had my boots shipped me w/in 48 hours. Amazon Prime returned/refunded the first pair I order w/ no hassles or retrun shipping fees.  I had my new larger size Muck boots to shipped me all within one week from my initial order date w/out paying any shipping fees.