This neck wrap is a safe, therapeutic, portable hot or cold compress for soothing tired, tense neck and shoulder muscles! Place ecofriendly neck wrap in the microwave for just a minute or two and enjoy up to 30 minutes of comforting heat. Place wrap in the freezer and it becomes a cold compress. Blue, 100% cotton cover, filled with flax and wheat seed. 17"Lx4 3/4"W.