I consider them small but please note. They should be compressible, so they should actually feel small. That being said, I'm 5ft 10", about 155lbs (male), and I originally ordered a medium size. Wednesday fits exactly as I expected. Fits snugly around the chest and shoulders. I later ordered a large and it seems a little more comfortable while still being a little tight (but not tight). I've used them in six BJJ classes (about 8 hours total) and they work great. I wear the medium size under my kimono and use the large size for know-gee. They are strong, elastic and perfectly protect my elbows from Gi burns. IMPORTANT note: My wife (who also wears a medium size, 5ft 2in and 140lbs) and I found out last night that it was RANK. COLORED rash guards. We didn't notice it before, but if you do know, it's pretty obvious: white, blue, purple, brown, and black. Someone at our gym asked if she had a brown belt because she bought a rash guard with brown sleeves. Keep that in mind if there's a chance your gym or tournament might have trouble wearing the color that corresponds to your rank.
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