Comfort Booties provide 100% all natural aromatherapy. The natural herbs & flax seed contour your feet and help to relieve stress, tension, cramps and muscle discomfort. Microwave for instant heat therapy/chill for cold therapy. Hot or cold, Comfort Booties can relax, rejuvenate and restore your body and soul. Features: 100% natural herbs & flax seed. Penetrating warmth. Soft, cozy fabric. Heats in microwave. Relieves stress, tension & pain. Materials: Fabric: Polyester Fill: 100% All Natural Ingredients, including: Lavender, Valerian Root, White Willow, Chamomile, Rosemary, Peppermint, Spearmint, Hops, Yellow Dock, Lemon Grass, Cinnamon, Yarrow, Premium Flax Seed, may include other natural grains. Dimensions: 10"L x 6"W x 2"H; Weight: 2.5 lbs.