core products cervical foam roll, blue - gentle (3") core products great for a variety of comfort and support applications. tuck under the neck, back, knees or ankles for a comfortable night's sleep or when recuperating from an injury. small profile makes it easy to achieve proper support without adding extra bulk. cervical roll easily fits inside standard pillowcase and offers two levels of elevation, 3.5 (firm) or 3 inch (soft). precision cut foam in a cotton/polyester cover.