Keep in mind that your heel should slide up and down slightly when you walk for a correct fit. As a shoe lover its been such a huge bummer to now have foot pain. Pour le travail, léger, confortable my originals fell apart so bought these they work fine I loved the shoe Got these as a replacement of the original charging base that was not working properly. While I am not aware of manufactures instructions, you typically would want to ALWAYS hook the headsets up to the Splitter Adapter FIRST, then plug the adapter into the phone. Problem is a lot of software I need for work is limited or wont work with Catalina. I only have one bud and I havent had them for more than a week. And when it arrived, it was as well made as all the reviews indicated.