King size pillows are larger than standard pillows, typically measuring 20 by 36 inches. They are designed to provide ample support and comfort for those who sleep on a king size bed or prefer more space while resting. Their size makes them ideal for side sleepers, as they help fill the gap between the head and shoulders. These pillows come in various materials, including memory foam, down, and synthetic fills, catering to different sleep preferences. King size pillows can also enhance the aesthetic of a bed, adding a luxurious touch to bedding arrangements.