The method for manufacturing a product, the method comprising - providing a stock (110) of a first material (11), the first material (11), in the stock, constituting a sheet material forming a first layer comprising a water- soluble polymer material; - producing a blank structure (10) comprising superimposing the first layer and a third layer and, between the first layer and the third layer, a second layer, the second layer comprising, in particular at at least 50 percent by weight, more particularly at at least 75 percent by weight, a fibrous material obtained from dryly placed fibers; - shaping the blank structure (10) in a molding step.