A protective liner 10 which is adapted to be selectively and removably placed within a garment 100 and which is effective to absorb waste materials emanating from a wearer of the underwear 100, having a pair of substantially identical elastic ribs 120 and a pair of substantially identical \u201cgrip tabs\u201d 20, 22, and which obviates the need for a diaper or diaper-like product. On the expansion drawings, the point a coincides with the point b. The rotating bladed wheel 3 has one or more blades 4. The blow mold has two lateral parts and a bottom part that jointly form a cavity inside which a plastics material pre-form is shaped into a plastics material container.