Good old soap shop's Deo stick is our own natural formula, handmade here at the shop. It contains essential oils and potassium alum which is the same mineral crystal deos are made from. It stops odour causing bacteria from multiplying without clogging pores or penetrating the skin. It is not an anti perspirant and it does not contain sodium bicarbonate. It comes in a cardboard push-up tube, 75 ml, and last for aprox. 2 months.