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The Balega Ultralight are very thin and rather smaller--especially in comparison to the other models. I've bought size Large in every sock, and they vary quite a bit. If you like thin, small socks, you may like the ultralight. Or go a size big if you want them to fit more comfortably.
On the other hand, the Blister Resist were way too thick and large. They had so much excess material that they felt horrible and my feet moved around in them. They are very hot. The material on the top of the foot is actually very thin, but the bottom makes up for it. That said, They make a comfortable sock to walk around in on my wood floors in the winter. Since I won't run in them, I give them use around the house.
The Hidden Contour and Hidden Comfort are similar. The Hidden Comfort are a tad thicker. They are both a bit thicker and larger than the Soft Tread socks, but they are comfortable and nicer for winter weather, when I tend to wear them running. If I were buying more, I'd go for the Hidden Comfort. Mine have stayed superbly comfortable longer than the Hidden Contour and still feel more padded.
I like the Soft Tread best because they are thick enough to be padded and comfortable, but I have to pull them snug on my feet so there is no room for my feet to move against the sock. Also, they are not so thick that I feel my feet get hot -- and I run in 100 degree Texas summer weather. Finally, the Soft Tread are made R and L foot specific, which I've found to be helpful for fit. The Ultralights are as well, but not the other three models, if I recall correctly. Though the Hidden Comfort came with an L on each sock, that stands for "Large", not "Left". Also, the heel tabs on a lot of these sock models, including this one, are great and do a lot to make sure the sock stays in place.
Hopefully this review helps a few folks decide what Balega sock might be best for them if they're looking to purchase. If you have questions, comment and I'll try to answer them.
I usually don't spend much on socks and just get low cut sports socks at Target. I barely fit into them because I am a size 10 shoe in women's. I decided recently to get professionally fitted for running/sprinting shoes at Runner's Depot. I got an AMAZING pair of shoes there which fit like a dream. I realized the socks I normally wear were actually too small (they were pulling a bit on my toes) and it started to annoy me, so I decided I would try some different socks to go with my new running shoes. I ordered these in the hopes that the size and comfort would be what I wanted (thin for running). WOW. These are the most comfortable socks I have ever put on. I haven't gone running in them yet, but I will update as soon as I go out for another run. I ordered the large and I have plenty of room in my toe area without there being any excess material. I can tell the socks would stretch and easily fit a larger foot and still be comfortable. Very excited to try them out.
*** Update: I purchased 2 pairs of these socks (one in this color and one in neon green). They lose their smoothness quickly by getting fuzzy easily. They are also thicker than I wanted, but also cushy and comfortable because of the thickness. They can cause a bit of sliding in your shoes if they are not laced tightly, but I was able to rectify that issue without my shoes getting too tight. I'm a bit disappointed at how easily they can get snagged on anything (basic kitchen tile grout was enough to snag the bottom and pull loops out) and how quickly they get fuzzy since this is the most I've paid for socks. But overall, they are still really comfortable, give my toes room (which most socks don't as I am a size 10 in women's shoes), and don't slide down when I'm wearing them. They feel good on my runs with my laces a little tighter. I am giving 4 stars.
I fell in love with Balega socks after purchasing a pair at a local running store. I was tired of my socks (purchased at TJM and Marshall's) wearing out quickly and sliding off my feet while running or doing bootcamp. Such an annoyance! These are great and make my feet feel about as comfortable as they can with what I put them through, lol. I now own 4 pairs! I'll keep buying them on Amazon to save a buck.
These socks fit well in large (I wear a size 10 shoe), but I did not notice when I ordered them that they were ultralight, and therefore different than the other Balega no-show socks I have ordered. They fit well and don't slip, but they are a little thinner than I prefer.