These are quickly knit in a day or two and will be great for fall season when the air turns cool and crisp but not so cold that entire gloves or mittens are necessary. They will be great for sitting in stadiums at football games or around a campfire.
The size should fit an average women's or teen's hand. Go up a size or two (or more - I tend to be a looser knitter) for a larger size hand.
Only 1 skein is necessary for a pair of hand warmers and really only about 125 yards total. They are knit entirely in the round on double pointed needles. The Lion Brand Wool Ease Worsted Weight Yarn I use for these is so soft and yet still very warm!