Riihivilla Hiisi is 100% Finnish wool, not solely Finnsheep, but there is also wool from mixed breeds and crosses with Finnsheep. Hiisi is made of long combed wool with a very tight twist, and it feels very soft to hand.

Hiisi is a 5-ply, worsted weight yarn. There are about 160 meters (175 yards) in 100 g. WPI is 12. The gauge recommendation is 20 sts / 10 cm and the needle recommendation is 3 - 3,5 mm European.

Handwash in lukewarm water although this yarn does not felt so easily as Aarni or Maahinen.

Hiisi is a good yarn for sturdy socks because of the tight twist it is durable. Hiisi is also a good all-purpose yarn for any other garments, and for instance cables show well when knitted with Hiisi. Hiisi is a tighter more dense yarn than Aarni, which is more fluffy and airy.