The first thing I noticed from the Saga academics riding sock was how extremely comfortable they are. I had just gotten a new pair of ski socks around Christmas, and these socks are easily way more comfy. The material inside the sock is definitely high quality, and I am curious to see how long they remain soft until they get crusty (will update the review on durability after a longer period of riding.)
I was riding with a thicker and heavier weight sock before getting this sock, and I was interested in the warmth difference. Changing to a thinner sock reduced the amount my foot was sweating in my boot, and therefore keeping me warmer on cold days. I found in my past thicker socks, I noticed the sweat from my feet was definitely getting pretty cold once the temperature dropped.
As mentioned before, riding with a thinner sock (mid weight) allowed my foot to breath a lot more and reduced the amount of I was sweating inside my boot. Obviously for days that freezing sweat is not a problem, a thicker sock could be ideal. As for waterproofing, its a sock, its difficult to judge Ive found that any water that leaks through the tongue of my Full Tilts will sink into the socks at an average rate.
The one thing I noticed is that you would need average to large sized feet to ride in the socks. Saga currently has them listed as OS, but for skiers with smaller feet I could see a problem with the extra material bunching up. For my foot Size 9.5-10, I found that it fit perfectly.
One thing I enjoy is the long upper portion of the sock, so if you like to ride with the sock high up your shin like myself, you will have no problem keeping it from bunching up on your shin as some socks do.
Overall, I was extremely pleased with this sock, especially how comfortable it was and I would recommend it.