I think each first-time buyer should try it on. My true size is 10.5 and 10D in barrie fits perfectly. I bought a pair of trickers (leather soul last pair - glad I only paid about 1/3 of full price) in 9.5 and it fits miserably large. I can't even return them so I'm getting by with super thick socks and sole inserts. Just my two cents in sizing experience in trickers. Excellent well made shoes, but recommend trying sizing in store.