ummmm not a clue! it's some soft somethingy on the edge and then has a catch basin made out of somethingy else. (good thing there aren't any men here - all this technical jargon would leave them confused and searching for their "tech talk for dummies" book) It might be worth a try, the catch basin is structured Much differently than the Diva which is why I'm thinking it's more comfortable - but then I never tried the Diva.