So after all of these shoe threads and people lifting in socks in the logs, I decided to give a go last night. I know people here are big advocates of chucks etc, but my shoes seemed pretty flat so I figured they'd be adequate. My gym shoes are usually my retired regular shoes ranging from Puma (car racing type with skinny as hell soles) to Diesel (currently using, very soft). For the past year or so I've had a problem with my knee moving in and out on lifts. I tried lowering the weight, bar only focusing on form, etc; hoping to improve my form to keep my knees from moving since it was affecting how much weight I could lift. Last night on my deads I decided to give it a try. Warmed up with 135, little knee shake. Moved to 225, knee went in a couple inches every rep. Took off my shoes for my work sets; 295, 315, 325. Felt like I was glued to the floor, no knee movement at all, and the 325 felt like cake. I can't wait to try legs on Friday without shoes. I think I'll see a huge difference there as well. Cliffs; tried deads in socks last night. HUGE difference/improvement.