Just coming through this pregnancy experience myself I am so grateful for my bolsters! Keeping the knees lifted while taking short stints lying on my back was made possible with the generous knee support that a bolster provides. Having a stuffy nose, swelling of the nasal passages, or rhinitis is common during pregnancy so, being able to lift your head up in a supported way while staying relaxed is a gift indeed. Being able to put a supportive pillow under one knee in side position is also facilitated by a bolster. Lying as close to face down as possible with a bolster under face and chest was a relief with my bolster. Bolsters really have been my buddies through pregnancy!