Baby hugs medium is a premium soft acrylic yarn with the added benefit of being tested to be free from harmful levels of over 300 substances. It is perfect for a baby - comfortable to wear and easy to clean. It is certified safe according to Oeko-Tex standard 100 class I, just what you would expect from RED HEART yarns. It is a size 4 medium worsted yarn made from 100percent acrylic fibers and measures 247 yards per 4. 5 oz. Ball. We recommend a size us k-10. 5 crochet hook and a size us 9 knitting needle for most projects. Machine wash warm, gentle cycle. Tumble dry low, do not bleach, do not iron.