I ride year round and our winters can be cold. Last year's coldest ride was 8 F and so I needed gloves that would protect my hands. I had a pair of Lobsters in the past (different brand) and they were perfect when the temps dropped below 20 F.
The Craft Siberians have promise but two annoying traits have limited their use to two rides 1) the center split between the index/middle and ring/little fingers is too long, meaning I constantly have to slide the glove back up lest the seam dig into my hand, and 2)there's insufficient play to actually manipulate the Shimano shifters.
You might think these problems mean the gloves are simply too tight, but when I'm not riding they are airy and almost floppy. A larger size would not help.
While I'm sure Craft makes great products, the Craft Siberian Split Finger glove design doesn't work for me.
I really like these gloves. They are windproof, and a terrific replacement for my old PI Lobster Mitts. Much lighter too, and surprisingly warm. I use these in the 30s and low 40s. Only issue I have is accidentally pressing the Di2 buttons as I grab the hoods while standing. Their not the most dexterous gloves. -)
I ride north of Boston and we had a week where I commuted to work (150 miles for the week) in single digit temperatures. I've been trying to find a good deal on gloves and have purhcase a number of different weights. This is my first pair that keep my fingers from going numb on a 20-30 mile ride in single digit temperatures.