I am a 'big boy' runner with the flattest feet imaginable. I wear hard nylon orthotics in all my shoes, and especially in my athletic shoes.  I wear a size 12.5 US, and I am happy to report that these shoes are a terrific platform for us 'big boy orthotic wearers, plus they are very well made.  If you are looking for a great shoe for these concerns, than this is it!  I am ordering my third pair as soon as I finish this review.