Temperatures are beginning to drop, which means it’s time to start thinking of practical knits like hats and mittens. You know, the accessories we really need when we venture into the bitter cold. Level up these staple pieces with Red Heart’s newest yarn, Heat Wave. The aran weight yarn, made of 100% acrylic fibers, is the first of its kind to keep you up to 12 degrees warmer when activated by sunlight. We can’t explain the science, but you better believe we’ll be getting our hands on this heat generating yarn, which is now available in 13 colorways.