Mabotolo a thovu a PET oyera, ophatikizidwa ndi mapampu a foamer a polypropylene, ndi njira yosalala, yoyera yopangira zinthu zingapo.Mapampu otulutsa thovuwa amasakaniza bwino madzi ndi mpweya kuti apange thovu lambiri pa sitiroko, popanda kugwiritsa ntchito zopangira mpweya.