Using this silk blend sleeping bag liner is easy. Simply place it inside your sleeping bag. You'll immediately notice the extra comfort and warmth it provides. For the rectangular liner, you can put your pillow in the sleeve for added convenience. When it comes to temperature control, the mummy version's shoulder openings allow you to adjust as needed. To keep your liner in good condition, follow the care instructions on the label. Usually, it can be machine - washed on a gentle cycle with mild detergent. Avoid using bleach or fabric softeners as they may damage the special fibres. Hang it to dry to maintain its shape and softness. Don't over - stuff it in the dryer. And when not in use, store it in a cool, dry place.