Curity™ NonSterile USP Type VII Gauze Sponge, 4 x 4 Inch, 1 Case of 2000 Traction Kits Accessories Retail boxed * Memory Foam 18747 Retail boxed * Memory Foam * Blue cover * Ergonomically designed to provide ideal spinal alignment and a therapeutic sleep posture to reduce head neck shoulder and back discomfort * Can also be used under the back knees or ankles * The high quality memory foam reacts fast to provide instant relief and comfort and provides slow memory foam recovery for longer support * The removable soft polyester and rayon cover zips off easily for machine washing * Hypo allergenic * No clips or clamps to lose Conveniently indexed in 10s for faster USP Type VII: USP means gauze sponge meets United States Pharmacopeial Convention standards