The Cocoon + is our premier Cocoon and features: A thicker foam pad base, custom fit cover with zippers and carrying handles, a buckle at the bottom to expand the length of the Cocoon by 5", a custom fit liner that is absorbent, leak-proof, removable and washable to protect from diaper or bottle leaks, a custom fit traveling case, and various colors of stretch knit covers can be purchased. Exterior dimensions are 29" x 18"