Due to the bolster's ability to provide relaxation to your legs it can help you improve your sleep quality. Placing a bolster under your knees helps you relieve pressure from your lower back as well. This also helps the blood to return smoothly back to your heart, improving blood circulation. They're typically used to add a decorative accent at the front or back of a bed. They can also serve a more functional purpose. Bolsters can be placed between your legs at night, to provide head, shoulder, back or hip support, by comfortably aligning your body.Packed bag has to be cut for it to expand.