Eye pillows help with regulating your nervous system, mood, digestion and heart. The weight of the flaxseed on the eyes stimulates the vagus nerve and combined with the lavender scent helps with relaxation, headache, migraine and stress relief. No essential oils are used. Depending on your needs you can use the pillow as it is, cold or warm: - Freezer - in a sealed freezer bag for an hour before use. - Microwave - on a clean surface; heat in 10 second increments until warm to touch. Please, always monitor while microwaving and do a touch test before placing the pillow over your eyes. Standard size: 8x6 inches. Removable and washable cover made from 100% cotton. Machine wash cold, gentle cycle. Tumble dry low. Insert is made from white 100% cotton. Spot clean only.