This particular Kickstarter project, from Kokoon, has not been the happiest for us. We joined in the crowd funding with lots of time for our planned trip to Antarctica in June 2015 according to the original delivery dates.
In December 2015 Kokoon announced a slip of 6 months.
In reality they were delivered in December 2018 and one of the headphones was broken, after some negotiations this pair was replaced.
Today I opened the case and the pair that I have been using were broken. Maybe I do expect too much but having headphones in a case for a month should not break them!