Since comfort is a subjective quality, the best pillow filling depends entirely on your personal needs and preferences. Down, down alternative, and shredded foam pillows tend to feel softer, while solid foam, latex, and buckwheat pillows are usually firmer. If you desire close contouring, foam or latex are more adaptive than other fill materials. Those who want a pillow with adjustable fill should opt for a shredded foam, shredded latex, or buckwheat pillow.