<P> In the 1970s , Hulseman 's son , Robert Leo Hulseman , came up with the now - ubiquitous red Solo cup . The red Solo cups are made of thick , molded polystyrene . They are known for being able to withstand drops , easily stackable , and disposable while price accessible . Their characteristic red color may conceal the drinking contents . </P>
<P> In the 1970s , Hulseman 's son , Robert Leo Hulseman , came up with the now - ubiquitous red Solo cup . The red Solo cups are made of thick , molded polystyrene . They are known for being able to withstand drops , easily stackable , and disposable while price accessible . Their characteristic red color may conceal the drinking contents . </P>
when did red solo cups come into production
when did red solo cups come into production
In the 1970s
In the 1970s