Opening the box was actually a challenge, I dont know what kind of glue they use, but I ended up ripping the box trying to get it open. They did not make any noise when walking on wood floors. Love turtle beach & the sound is amazing! As for the sizing, I would say they run maybe one size smaller than normal USA sizes. I had a problem with one side falling out but once I changed the tip size they fit much better. These shoes check all the boxes for me. Im sure birkenstock makes a good product however they are too wide. Get em! Typically I am a 9-9. Cómodos a pesar de ser algo pesados excelentes materiales.