Thanks! I used this pattern:
For the mittens, it's just cheap Red Heart yarn, (what can I say, I'm a poor college student, and two skeins of yarn for 5 bucks is really appealing
) but it works really well-- I took them out in the snow for an hour or so, and they didn't soak through at all. Alas, on the fingerless ones I seem to have thrown away the labels, but I think the green was called something like "Lambs wool" brand, or something along those lines. It was chunkier, so I didn't double the yarn.