Metallic yarns are hard to knit, but a new study found a way to measure how well they can be knitted. By testing the yarns' strength and flexibility, researchers discovered that the yarn's ability to stretch and bend affects how easy it is to knit. The study showed that the strength of the yarn doesn't really matter for knittability, but how much it can stretch and how stiff it is do. A mathematical model was created to predict how easy it is to knit metallic yarns based on these properties.