Just got my Keens today, and think they look really fun for a clunky sport sandal. They were actually lighter weight than I expected, and softer on my foot. I usually wear a 9 in shoes, and an 8-8.5 in sandals. Based on reviews, I ordered a 9 to be safe. I will likely keep it, as it seems quite good, although there is a little space behind my heel, and I wonder if an 8.5 would have been fine - so don't totally agree that they really do fit "small" as is typically suggested. I would suggest ordering within the mid-upper end of your usual shoe size, but not necessary going beyond the largest size you would normally wear.