I work in research where we measure people's brain activity using nets of electrodes over the head, with about 100 electrodes, each covered in a sponge, which is soaked in solution.
We need to measure brain waves when certain sounds are played through headphones so we need headphones with a neck band, which can sit below the net, and the phones need to survive some drips from the sponges - any ideas on what to get?!
Well, since you need behind-the-neck 'phones, and sound quality is unimportant here (in fact, you'll be feeding the headphones only midrange frequencies anyway - no really deep bass or really high treble), one of the very few such models that are truly water-resistant is the recently introduced Sony MDR-G57G. But keep in mind that no consumer headphones are truly waterproof - they can't be immersed in liquid.