Work and fit great if you keep in mind these are fin socks - not aquasocks
597101
These socks fit the bill if you keep in mind these are fin socks NOT aquasocks used to go over rocks, etc.  I took these with me on a trip to the caribbean and they saved me from getting blisters while snorkling.  My feet are a size 11.5 and the XL fit just fine.
1575609
Fit great (as expected) and look terrific. We wear them with our full-foot snorkeling fins but not with our open-heel scuba fins; they don't go up high enough for those types of straps.
1861283
I'm a size 9.5 US. so I got the 42/43. I had planed on wearing them bare foot but ended up needing to wear a pare of double layer nylon running socks or neoprene socks to keep them from falling off. which ended up being for the better anyways because they are very comfortable wearing them like this and I have a little protection when I take the fins off when I'm walking around. As for there performance? Well I'm use to cheap Walmart swim gear and when I put these on, it was the difference be tween night and day. I know you could put more money in to fins if you wanted to but for me being new to the sport of free diving and spearfishing, I feel like these were the right pare to get. I have no complaints and I'm more than happy.
2214043
Nice fit, well made. They do not float, but for pool fins that isn't a problem. These are greatly improving my workout.
3124417
Good fit, but not quite no-show.  I bought the smallest size and I wear size 8 Sperry boat shoes frequently.  The socks are comfortable and stay on, but the tops can be seen.
757999
I bought these for lifting at the gym, but since then I use them for that and also work and pretty much everything else. Unlike most of the other reviews I don't believe that these are knockoffs, if they are they're a damn good one. I do however belive that they may be a defect batch or an "outlet mall" batch bc of the fact most of the people- myself included- have either a small scuff or stain; I mean mines just on the laces and I was going to relace them with black ones anyway so it's not too big of a deal, and even if I wasn't they're going to get dirty anyway. The fit is pretty good, I purchased the size 8 forgetting about how wide they make them in hindsight I probably should've got a 7.5 but they're not too big to stress over- a thick sock will do the trick. Overall, they're very nice and comfortable and I'd probably buy them again. (also, peep my sick spongebob bandaid)
3991959
Its a high quality aqua sock, but much like all aqua socks, your feet are going to get tired if you walk lots in them.  They are great for their intended purpose though.  I use them to go kayak fishing, and walk on shoreline rocks.
4514052
I like these fins a lot because the toe opening is on the planter side not the dorsal side which can create blisters from the hard rubber.  Unfortunately they sent me the wrong size, but they work just fine.
3412994
Good socks and fit really well, looking cute on my feet. Generally they do a pretty good job, but they hurt a bit between my toes when I do positions like downward facing dog - which is probably normal for this kind of design. In all other positions they work well, provide a good grip and keep my feet warm.
1816097
bought normal size 13 but i was swimming in them, traded in for size 12 and they fit perfectly. be prepared though, you must break these in, your shins/calves/feet may hurt for a few days.
3714628
Very nice. I don't do a lot of snorkeling but they were great for the little bit we did. I would suggest that you order the neoprene water socks to wear with them since the plastic is very stiff and would probably cause sores without them.
Also, my sister and I are women that run on the smaller size and they adjusted and fit jut fine.
361033
Good neoprene socks, don't take up much room in shoes, keep feet fairly warm. Wore them too canyoneering in Zion Park in Utah in May. Water was easily in 50's, very cold in slot canyons and areas with no sun. If your going in/out quickly, these work, but if your easily chilled and in the canyons for more than 3-4 hours these are probably too cold. I was chilled and shivering because my feet were too cold.
2234307
I use these in my morning lap swimming routine - they've worked exactly as advertised - very comfortable and effective for my needs.  One reviewer noted that his fins had an unpleasant odor.  I have never experienced this problem.  Amazon could have made the ordering process easier by including an easy to reference size chart.  I generally wear a size 12 (US) shoe (size men's 45 for EU).  I ended up selecting size G which supposedly fits sizes 10.5 to 11.5 US / 44-45 EU.  For what it's worth, the fins fit my feet well so I am happy that I biased my size selection downward.
245134
I really like these water shoes, they fit as expected, and wear well.  Be forewarned that the 'insole' that comes inside them aren't really useful and provide zero arch support. They (the flat neoprene insole) are also loose when you use them to walk/run in water. I lost one in the Gulf of Mexico accidentally and unknowingly - I HATE contributing to litter in the ecosystem, but I looked for it and it was gone. So I took out the other "insole" and put in a pair of SuperFeet. This provides a nice, tighter fit and good arch support. With the SuperFeet in, I could wear these all day.  I bought a second pair for when the first pair wear out. So long as you replace the insole with something tighter and better for the foot, they're terrific.  That's the only reason I didn't rate them 5 stars.
3887689
Work great!  Off-brand fins if you're looking to save some bucks.  Kinda big, though, which is fine for my mini-log with thruster set up.  Probably wouldn't put them on my shortboard.
2866058
These are really nice, thin socks.  But they aren't athletic socks, hard to tell from the picture.  Thinner and smoother than athletic socks.  One star off for being misleading - now I have to buy another set of socks that are actually athletic socks.
2824930
Purchased these fins for a trip to Aruba.  They worked perfectly for snorkeling and in the mild waters of the western part of the island.  I had to purchase some neoprene socks to go with it since i have narrow feet and the size i got was a bit loose (7-8. i am an 8 in the US).  Great product!