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Affordable and readily available, Red Heart is the yarn brand that many knitters, including me, used the first time we picked up a pair of needles. I was surprised to see a pitch from them land in my inbox, since hand-knitting yarn is usually something I don’t get to cover for TechCrunch. But the brand recently released a new line of yarn called Heat Wave, which uses proprietary technology to create acrylic yarn that generates heat when exposed to sunlight.
Like Red Heart’s classic Super Saver yarn, Heat Wave is completely acrylic, but becomes up to 12°F warmer when exposed to the sun, even on overcast days. I learned how to knit on Super Saver and still keep a few skeins in my stash. When I opened the box of Heat Wave samples Red Heart sent me, I was surprised to see that the yarns felt nearly indistinguishable. I took my skeins of yarn outdoors on a sunny day with an infrared thermometer and found that Heat Wave did indeed measure up to the company’s claims, emitting more heat than either Super Saver or a ball of 100% wool yarn in similar colors.
Amy - Olsen - Product - Development - Lead
Amy Olsen, the product development lead of Red Heart, tells me that the company worked with a supplier (Red Heart prefers to keep their name under wraps) that developed microscopic acrylic fibers with heat-generating properties in the core. Since it is part of the structure of the fiber, it won’t...
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