As expected from Sennheiser, these earbuds are of excellent quality and are extremely durable considering I have an awful habit of getting corded headphones caught on/tangled in things. As I used them for conference calls they did get warmer and voices came across clearly. It sways from side to side and I am hopeful it will not collapse. Very fast delivery, received it 2 days after I ordered it. Just setting up the speaker was extremely frustrating. Material is thin but not see throughCon for me is the length is bit longer than what I would have liked. According to my son, they feel comfortable. This is what the other reviewer meant by inverted. My loss. anything bigger in shoe size you might have to turn one shoe sidewards in the cubby to make it fit.