Softshell clothing can basically be handled in the same manner as shell clothing. The main difference is that unlike shell garments, softshells have no membrane, so their ability to resist moisture is more dependent on impregnation. Thus, by not washing softshells unless absolutely necessary, you won’t have to re-impregnate them as often.
Drying your softshell clothing in a drying cabinet or dryer as often as possible is encouraged. This is because heat helps reactivate the impregnation’s water-repellent qualities. If you do not have access to either, use an iron on low heat with a towel between the iron and the garment. Keep in mind that when you use a tumble dryer, there’s more wear on the garment than when using a drying cabinet. After the garment has dried, you can run it in the tumble dryer on low heat for 20 minutes, for the same effect as in a drying cabinet.