Silk bedding linen requires special attention from you in order to stay intact and well-polished. The best way to care for silk is simply avoid contact with chemicals, especially those with strong basic/acidic properties such as bleach, and avoid extreme temperatures, especially heat.
Always wash your linen in lukewarm water at approximately 30°C. If you use a washing machine, make sure to use a silk or delicate setting with minimal spin time. Air-drying your linen on a washing line is preferable to machine drying. Try to iron your linen on the inside when slightly damp and use a cool setting after every wash to keep it in shape.