Sirdar Bonus DK is an incredibly popular 100% acrylic double knit yarn, it is softer and less scratchy than most & is machine washable. What's it like to work with? Despite being a great value acrylic, this DK yarn is super soft to work with, gentle on your hands Baby Bonus DK is ideal for knitting and crochet projects. What is it best for? With a standard DK tension, Baby Bonus DK can be used across all our Sirdar and Hayfield DK patterns. The 100g balls make this yarn ideal for blankets and other larger projects.