If you wear your beanie frequently, chances are it has accumulated some sweat and dirt. However, washing our Lift Down beanie is super easy: Just throw it in the washing machine and set it to the coldest temperature setting (also sometimes called delicates/hand-wash).
If you stain your beanie, you can just wash it using lukewarm water mixed with 1 tsp of laundry detergent.
Once the stain is removed, let the beanie dry by hanging or by rolling in a towel. Do not iron.