Hayfield Bonus Tweed with Wool Aran by Sirdar is a wool/acrylic blend with subtle flecks of coloured fibres which gives the yarn a subtle tweed finish. In a giant 400g ball, you will only need a couple of balls of this hand knitting yarn for a sweater, eliminating all those pesky joins you normally have to deal with at the end of a project. This knitting yarn works well for classic aran style jumpers and cardigans and the subtle flecks of colour add a wonderful tweedy effect to your knits. Hayfield Bonus with Wool Aran is a standard aran weight yarn that you can use this for all Sirdar and Hayfield aran patterns. 80% Acrylic 20% Wool. 100% acrylic. Machine washable at 40 degrees/ wool cycle. Do not bleach, do not iron.