The Interstate down pillow is the largest size and is usually only seen in VIP rooms of 5-star hotels. It is made of 80% high-quality soft duck down, with different down weights (900g to 1,480g), making it suitable for different sleeping positions; such as stomach, back, and side sleeping. Side sleeping is divided into narrow to wide shoulders. The neck needs soft yet firm support, which is the advantage of a down pillow, as it follows the curve of the neck, providing 100% support. The width of different shoulders can be adjusted by the weight of the down.