Hayfield Baby Bonus 4 Ply is a great value option for your baby knits. Available in a range of beautiful baby shades it is soft on skin, yet warm and cosy for those colder autumn and winter months. This 100% acrylic yarn is a hugely popular choice, knitting to a standard 4 ply tension it is fully machine washable and can even be tumble dried at low temperatures.Hayfield Baby Bonus 4 Ply is a great value option for your baby knits. Available in a range of beautiful baby shades it is soft on skin, yet warm and cosy for those colder autumn and winter months. This 100% acrylic yarn is a hugely popular choice, knitting to a standard 4 ply tension it is fully machine washable and can even be tumble dried at low temperatures.