You're welcome! Wool would definitely be warmer since that is your goal. I'm not sure, but I think you can get a hat out of one skein. Guess that would be expensive, but you could do it over time. Maybe as Christmas gifts? I've never seen anything that bright elsewhere. I thought it might be cute for kids hats, too! :teehee:
Now I see that it's a fine weight yarn #2. Might take more than one for a hat, but would be nice and thin to go under helmets if need be and since it glows in the dark it would be a safety feature.. You could also use it doubled just for some stripes of color with worsted weight yarn.