King size pillows are larger than standard pillows, measuring approximately 20 inches by 36 inches. They are designed to provide ample support and comfort for individuals who sleep on a king size bed or prefer more space while resting. These pillows are often filled with materials like memory foam, down, or synthetic fibers, catering to different sleep preferences. Their size makes them ideal for couples, as they can accommodate two people comfortably, or for those who enjoy sprawling out during sleep.