Bolster Flex, or Side Pillow, is designed to support for the head and neck as well as the knees and legs, prevent sprain and pain all over body for those who tend to sleep on their side. Hugging a Bolster pillow can straighten the back as it encourages a good postural alignment and it also can help decrease pressure on hips area by placing one leg across the Bolster during your night sleep . Plus, ventilation holes on pillow surface deliver a great breathability, resulting in a comfortable body temperature required for good night rests.