The perfect Clog, but ....

I wear now since some 5 years, these clogs. They should be compared with any existing on the market "plastic clogs. None are so soft and flexible. Ideal for problem feet. A polyneuropathy I can wear almost no normal shoes. I got married with that thing even ^^!
Unfortunately, the clogs will vary. I always buy the same size but in different colors. Black falls in this smaller than red. Either there is a manufacturing defect or is it actually on the coloring of Kunststoffes.Das is the only negative.