I bought the thinner heattech gloves from Uniqlo for about 15,000. About a couple of weeks later it ripped in the webbing between the index and middle finer. It was also kind of hard to use it on my phone even though it says it's touch capable. Not that warm either.
That being said . . . I'm also looking for some new gloves. I'm going to try looking through gmarket today. (Cold) fingers crossed.
I bought the same gloves from Heattech and the first time I (carefully) put them on I already saw a gap between the thumb and index finger. The hole hasn't gotten *much bigger and they do keep my fingers kind of warm considering how thin they are. But they're not constructed very well so I'd find something else if you're not already stuck with them.
As a side note, though, I do recommend the Heattech leggings/tights that come in a bag. They work pretty well. However, make sure you know your size in cm because 1) Heattech S, M, L are different sizes in cm depending on the type of legging

and 2) you can't exchange them even if you didn't open the bag. I luckily had a manager take pity on my sorry situation and let me exchange it "this one time."