A hair conditioner is a chemical agent that confers to damaged hair some elasticity and combing ability, adding a befter look (sheen, soft, supple, etc). The objective eficiency of such type of cosmetics can be assessed by tensile testing. In this paper the eficiency of 4 comercial conditioners is evaluated by their elasticity and breaking load. The combing ability combability is also evaluated using a device adopted to tensile tester which simulates the combing operation. The 4 products tested show an improvement in hair elasticity, and resistance together with a better combability performance.