The lavender flowers and flaxseed which fill these pillows bring deep heat and relaxation to that place which most likes to hold tension: your neck. The combined affect of the lavender aromatherapy with the long-lasting heat relieves aching muscles. Microwave one minute for 15 minutes of moist, aromatic heat right where you ache, even if it is not your neck. Covers may be removed and washed in cold water. 20"