I ordered the Boston clog in the Tobacco color for my husband.  He has never worn clogs in his life or worn any Birkenstock products for that matter.  I am a lifelong lover of both clogs and Birkenstock's products.  My husband is a soccer player and often has problems with his feet due to the fact that most soccer players like to wear their soccer boots on the small side because they think it gives them a better feel for the ball...what it really gives them is ingrown toenails.  He has been in pain for weeks.  I ordered these without telling him because I knew he would take one look at them and say he was not wearing a clog.  My theory was that once he put them on he would love them so much it wouldn't matter that it was a Birkenstock clog...that is exactly what happened.  He put them on last night when he came home from work and wore them until he went to bed.  Then he actually wore them to work today.  He loves them.  I ordered a size 45 M.  He wears a size 11.5 in most shoes.  His feet are on the wider side of average and he has a very high instep.  The 45 M was perfect for him.  I like the Tobacco color.  It is a bit lighter than I thought it would be, but it looked nice with the olive green chinos he wore today.