Wool needs a little extra care when washing. However it is not a fibre like cotton, it repels dirt and is self cleaning and does not need to be washed as often as cotton. Ideally wash it as little as possible. Often hanging it outside and spraying it with a little mist for a day will freshen it up. It can be worn many times without washing and you can spot wash it if something has been spilled on it. It sounds strange but it works.
Care - Untreated wool brands: Engel, Selana and Cosilana are made of untreated merino wool which ideally needs hand washing. Wash very gently by hand in cold water making sure to use the same temperature both for washing and rinsing. Changing the temperature can shock the wool and shrink it. You should use an organic wool soap or mild wool detergent. Stretch the wool into shape when wet, roll the item in a clean towel to absorb excess water before laying flat to dry (ideally on an airy surface). Never wring it. Especially wool fleece as it can be destroyed by wringing.
Many people, including us wash untreated wool on a gentle cold machine wash such as a wool or hand wash program. This is at your own risk and you need to be sure your machine actually washes and rinses at the same temperature, making sure to use a wool detergent. If you are planning to wash it in the machine it may shrink a bit length wise, to prevent this happening stretch it lengthwise when it comes out of the machine or perhaps even buy one size bigger. If you use the machine to spin items, the revolutions must be below 400.
We recommend washing all wool fleece gently by hand, no rubbing, squeezing or wringing. Lay flat on a towel to dry. Again often spraying a little water mist on it and hanging it out will help it self clean.