This is one of the best ways we've found to gently scent bed pillows! As your head warms the pillow the heat helps release the lavender oil stored in the lavender buds harvested while the buds are still closed. The oils are then gently released to the air. No synthetic sprays, no fake lavender smells, just pure lavender bliss at your head for a restful sleep. Made by our friends Albert and Michael and their crew in San Francisco, we are long-time fans of this simple insert. Whatever you do, don't wash it with the case! Wet lavender is no one's friend! Lavender. White Linen. Silk. Made in the US.