I had to go down a half size from my usual size. The toe box is roomy in width & height for your feet to splay out. The inside of the shoe is smooth with no seams or pressure points & fit well with ultra thin wool socks or sock-less. After 50 miles of running over rock & root infested trails these shoes rock. They are light and provide good cushioning & underfoot protection. The 6mm offset keeps you low to the ground & promotes an easy forefoot running strike. Stability and traction are excellent (except for sticky mud) & I found my cadence slightly higher & smoother. Kudos to Moosejaw since I got these for 20% off and in 3 days.