Luckily, I still had my sock insert in my recycle bin. The packaging reads Mens 9-12 or Ladies 10-13 is a size L. XL is listed as Mens 12.5-15 and Ladies13.5-15. Looking at your name I am thinking hard here that I should be able to give you some comparison for width. Although the sock is substantial,the foot of this sock is still quite stretchy. It is not one of the styles that is very tight, form fitting, or ribbed through the foot area. We bought a L and comparing a new pair with one that has been laundered there is no difference is size after a hot dryer.
If you hover your mouse over or click on the sizes the corresponding numeric size will be displayed.