VITALFOAM 4 lb Density Thick Size viscoelestic memory Foam Pillow. (Approximately 24x12x5") Revolutionary technology shapes to the head and neck. It reacts to the temperature of the body to form to the head and neck, giving proper support while maintaining softness. May elp with Headaches, Neck Pain and insomnia. Hypoallergenic, antibacterial/fungal. A variety of conditions such as headaches, neck pain, back pain arm and hand numbness can be helped with proper Cervical Spine Support. Memory foam is a very dynamic material and sizes will vary slightly.