- Ergonomic design for cervical support: arched pillow that fits the human neck curve, providing soft but supportive contact to relieve neck, shoulder, and back pain. Improves cervical comfort and can enhance blood circulation for side sleepers. The pillow's temperature sensitivity makes it feel softer in warmer conditions and firmer in cold conditions. The tunnel height is 2.8 inches; please confirm your arm diameter is less than 2.8 inches before ordering. - Perfect support with durable frame: internal Patented ABS plastic steel frame delivers reliable structure with a curved shape that allows the arm to sit under the pillow, preventing pressure and discomfort during sleep and improving sleep quality for side sleepers. If you’re not satisfied, you can request a free return and full refund. - Material and care: the outer surface uses a soft memory foam fabric that recovers its shape after use. A removable ice silk cover is easy to wash, comfortable, and durable. Note that because of the ABS frame inside, the pillow may not be as soft as ordinary memory foam pillows and can feel a bit firmer. - Best choice for couples and on the go: hug the pillow to stay close without arm numbness, so partners can sleep nearer. It is also ideal for seated naps during office lunch breaks, at school, while traveling, or in other environments.