beyond bamboo bolster pillow case | fits 18" x 8" bolster pillow | 300 thread count sateen fabric (light gray) beyond bamboo beyond bamboo bolster pillow (case only) - fits 18" x 8" bolster pillows. for best results hand wash or use the gentle cycle of your washing machine with a mild detergent in cool or cold water. do not use bleach. use very cool heat in dryer or even better let it air dry.