Ultimate Construction:Each toy is made with two layers of industrial grade nylon and 1 layer of soft fleece on the outside. All of these layers are sewn together to make one super strong layer of material.Each toy is sewn together with 2 layers of cross stitching and then 2 layers of linear stitchingAfter the toy is sewn together an additional piece of black nylon trim is added to cover the four rows of stitching. This extra piece of nylon is sewn with 3 linear stitches to give the product a total of 7 seamsVeterinarian Recommended and ApprovedEach toy is washable (air dry)And they Float!