Finding a trail shoe for a narrow foot is not an easy task. The Nike Air Max Assail Trail fits the bill even though it’s listed as a D-Medium width and not narrow. An added plus is torsionally stability (no side-to-side twist) and an inflexible, thick, shock absorptive sole. This can help alleviate ball of the foot pain. It will also accommodate an orthotic which is great.
Dr. Jenny Sanders Shoe Blog 
I love your blog! Thanks for all the great reviews — I love the rollerderby stuff too!
Can you recommend any shoes that would work well with PTTD inserts? They’re so wide and deep that they don’t seem to fit anything. I tried finn comforts, but they’re so long, it hurts my extensor tendons trying to keep them on.
Thanks for your suggestions and your blog!