Hi! I've purchased men's Merrell Moab hiking boots and I found they seem to run about a 1/2 size small.
I have owned a pair in an 8 medium for four years. I usually wear a wide and these fit. I love these boots! Am buying a new pair.
I have a pair of Moab waterproof hikers. I usually wear a 9M, but a 9.5M is a perfect fit. I suggest a 1/2 size up.