Ultimate Construction: Tuffy toys can have up to 7 rows of stitching. The number and rows of stitching depends on the shape, size and style of the toy. Two directions of cross stitching hold the multiple layers together. Rows of stitching hold the webbing around the materials edge, and the toys' parts are sewn together with up to 3 rows of stitching. When possible, a protective webbing is added around the outer edge and sewn up to 3 more times. Tuffy toys can have up to 4 layers of material depending on the shape, size and style of the toy. Our Ultimate series can have up to 2 layers of Luggage grade material. Certain layers of material are coated with a layer of plastic to hold the material fibers together. Finally we use soft fleece for the outside layer. Protective webbing: For our Ultimate series we add an additional layer of webbing, whenever possible around the outside edge to cover the seams of the toy. This is sewn multiple times, for added durability. Squeaker Safety Pockets: Squeakers are sewn into material pockets inside the toy. This additional layer of safety can give you the time you need to safely remove the toy in the event your dog reaches the core of the toy. These toys are machine washable (air dry) and float.