These socks were perfect out of the box! The PhD design creates a fit that works wonderfully with the active movement that occurs while running. I love how breathable the ultra light thickness is and yet how comfortable they are still. The mini length is my favorite for trail running because the top of the sock band fits snug against my skin well above my ankles, which prevents small rocks and other small things from getting in between my socks and skin. The wool fiber qualities make for a super quick drying sock also. They are very comfortable and I tend to want to wear them all day long after I run in them. I have never once gotten a blister since I started wearing SmartWool's PhD socks. Doing all this while still managing to look amazingly cool. SmartWool is king!
P.S. the Ultra Light Micro sock is also a beast too and I prefer those for the roads or anytime I won't have to worry about small rocks getting into my socks.