From website of Hoooked:
Sustainable yarns can be affordable! We have a great cotton budget yarn for you to knit or crochet with. Hoooked Recycled DK cotton is made with respect for the environment and free of any additional dyes or toxic substances. And best of all: very budget friendly! This cotton yarn is super versatile and can be used for a variety of projects, such as amigurumi, summer tops, soft blankets, spring jumpers and baby items. A perfect yarn for making soft textures in both crochet and knit. The collection has 32 beautiful colours and matches perfectly the colours of our other recycled yarns, such as RibbonXL.
Soft Cotton DK is made of 80% recycled cotton and 20% other recycled fibres. Each bobbin weighs 50 grams and has approximately 85 metres of yarn. This is a DK weight yarn and we recommend using 4 mm (US size 6) needles and hooks. This yarn is machine washable on low temperatures. Do not tumble dry.