Some sweaters I have owned for years and they still look new. Taking care of special knits means more than following care instructions on the tag. Regardless of the sweater type, I take care of all sweaters in the same way.
(1) Wash knits on gentle cycle with other knits
(2) Use cold water
(3) Skip the usual detergent and choose Woolite
(4) Air dry inside on a drying rack
(5) Only wash sweaters when absolutely necessary,
washing too much will cause significant wear