At the bottom of each cup hole of the Cup Cozy Pillow is a Cup Cozy Pillow Coaster. This is what your cup actually rests on when you use your Cup Cozy Pillow. If you lose any of the Cup Cozy Pillow Coasters it is recommended that you purchase a replacement set. This will help maintain the interior foam structure and hold the cup hole fabric material smooth and taut for optimal cup holding function.