As noted by most posts above - your riding conditions and temperatures are critical to the correct answer.
In Bellville it seldom gets to single digits ... BUT, 5km from home the R300 dips at Hazendal and the temperatures dips even faster. Often down to degrees, seldom below 3 degrees. The trick being that 5km further it is back at 9 or 10 degrees, then just heating up from there for the rest of the ride.
I have started these rides with full finger gloves, just to put it in my pack after 10 or 15km ... then again, these rides typically mean I am going to take of layers of clothing as well. So I got the Mule hydration pack for the extra storage. This only applies to 100+km rides in the winter. (which I should be doing now in preparation for Augrabies)
At Augrabies it is a whole different ball game !!!! Starting in 3 to 4 degrees celcius .... add wind chill and those firts 5 km are a slow defrost session .... by the first water point the script has flipped, reaching 10 to 15 degrees and heating up to low 20's. Thankfully they have the option where we can take of layers, put it in a bag on the back of a bakkie and pick it up back at the finish point.
So For Augrabies I start with latex gloves, then full finger gloves over that ... It stops the freezing ... BUT !!! After a few km your fingers start sweating, so you stop and remove the latex and use the gloves to the first or second water point, depending on how it heats up. Then again, with those thorn tree bushes - best to keep those full finger gloves on !!
I am noting the feedback about the First Accent thermal inners ... will try this for Augrabies. (can only be better than the latex .... that is only an emergency measure, and only for the worst of the cold)
