Red Heart-Buttercup Yarn. Buttercup is suitably named as it is butter-soft. This light and airy yarn will work up quickly for baby garments, blankets and toys. Its delightful hand will make any garment tempting to snuggle. Weight category: 5. Content: 67% Polyester/33% Nylon. Putup: 1.76oz/50g, 63yd/57m. Gauge: 12s x 16r = 4in/10cm on size US11/8mm knitting needles. Suggested crochet hook size L11/8mm. Dyelotted: We try but are not always able to match dyelots. Care: hand wash gently in cold water, lay flat to dry, do not bleach or iron, dry clean with P solvents only. Imported.