I wear a 30/31 in pants, what size should I get in this?
I agree with Kirby. I wore a 10.5 in Mad Rock Flashes and I went down to a 10 in these. I wear a 10.5 street shoe. The pain will suck for the first 5 or 6 times that you really climb in them, but it will be worth it.
The first time I put my Dragons on I thought "What was I thinking?" I went down a half size from my street shoes on these and believe me, that was more than enough. It took a half dozen trips to the gym to get them broken in, and although they still hurt my feet after a while and walking is awkward and painful, they perform like a champ on the wall. The downturned toe holds onto just about everything it comes into contact with, and the heel has performed much better that I had originally thought it would. The lace ups keeps the shoe on your foot like a glove. The best bouldering shoe I have ever had and dominates on overhanging routes. Believe me the pain is worth it to for the performance that you will receive from these shoes.