This unique wrap came about through research and input from our customers. Here at Lavender Scents, we listen to our customers opinions and/or suggestions. The need for a neck wrap that would also provide heat therapy to the back was apparent to us. This wrap extends 15" down the back (large extends 19"). Covers your shoulders and upper back with a moist, penetrating heat. Heat in the microwave 2-3 minutes (instructions enclosed with each product).Removable insert is billowed in sections to keep contents evenly distributed (will not fall to one end). An all natural fill is used, containing flax seed infused with pure essential oil and organic herbs/leaf (ie: lavender buds, eucalyptus leaf).