The inserts are not flat, but have some punctiform bulges. I do not feel well
Great style and fit! However, there are bulges on the earbuds that I find very uncomfortable. I replaced the earbuds with Gel and Boom! therefore only 4 stars!
Pros
My feet are on the edge of the usual 13 and 13 widths, and the regular size is a bit tight for me.
Cons
Poor Ventilation - Lack of air and ventilation can lead to smelly and sweaty feet.