For what it's worth, here's info from Paula Begoun, who people tend to love or hate.

sodium C14-16 olefin sulfonate
"Used primarily as a detergent cleansing agent, but is potentially drying and irritating for skin."

as opposed to, say,

sodium laureth sulfate
"...considered gentle and effective as typically used to formulate cosmetic products (most typically facial or body cleansers and shampoos). Despite the name similarity, sodium laureth sulfate is NOT the same as sodium lauryl sulfate. It is a milder cleansing agent due to a higher amount and different chemical structure of the fatty alcohols that required to manufacture this cleansing agent."
*3B, medium/fine, normal porosity, normal elasticity, shoulder-length when dry.