Fall into Autumn Swap

Topic of the week
Now that in some geographic locations the weather is starting to turn cooler, do you change the type of yarn(s) you knit/crochet with? If so, what do you now knit/crochet with instead and why? If not, why do you not switch and what do you knit/crochet with?

I don't change type of yarn as much as type of project. In the summer I tend to knit socks and other small, portable projects. As the weather starts to change I start to think of more cozy projects - sweaters and blankets - things that require lots of time and keep you warm while you're knitting them. When it's cold I love being able to settle in with some tea or coffee and some good music or a movie with a long stretch of knitting in front of me.