I had some difficulty figuring out what size to buy. I read lots of different reviews online where I would read to purchase a full size up or down from your street shoe size. I wear a 9.5 - 10 street shoe, a size 9 in Arrowheads, and I ended up going with a size 9 for the 5.10 Team Shoe. They fit amazingly, and so far I have been extremely satisfied climbing with them.
This review was written in the old system and had content requirements that are different than reviews written today.