The core is the middle of the product where urine is absorbed and stored. It consists of three parts. Surface material Also known as the top sheet, this part of the product keeps your skin dry and comfortable by absorbing the liquid. It is composed of a fibre material made of polypropylene, polyethylene polyester, and viscose. Acquisition Layer This layer transports liquid away from skin, to the absorbent core of the product where it is stored. Materials consist of wood or polyester fibre. Absorbent Core This is the innermost layer, consisting of paper pulp, sometimes in combination with superabsorbents and/or other paper-based materials. This layer traps and stores the urine, keeping the wearer dry.

This is the shell of the product, designed to hold the core together and create a proper fit for the wearer. Two parts make up the chassis. Back sheet A water-resistant outer layer made of polyethylene, or sometimes a fibre material. Its purpose is to prevent liquids from leaking through onto the wearer's clothing. Fit and Comfort Features Fastening materials and elastic materials made of polymers keep the product in place.

Small amounts of adhesives are used in both the core and the chassis, and some products feature prints or scents. Adhesive Consists of various polymers and synthetic resins Fragrance Consists of perfume Print Printing is done using non-toxic ink

Release paper This protects the adhesive part of the product prior to use, and is made of silicone-coated paper. Single pack Some products come wrapped in a polyethylene film, which is sometimes silicone-coated. Single packs protect the product so that you can carry it around without it getting dirty. External product packaging Consisting of a polyethylene bag or box, it protects the product. This is the package you see on the shelf in stores.