Phone calls sound good also. Also good robust sole and reasonably light weight. The straps are not adjustable. They are very warm (almost too warm) but its not winter just yet so they should be perfect this winter walking around on our hardwood/slab floors. I love these shoes, the soft footbed is so comfortable. Plastic is to slippery to wear. Its still going strong. I decided to use 2 1/2” screws to remount it and slide some of the brackets to go into the stud. Seemed to work OK until i updated my devices and tv to 4K. We compared a lot of similar products and went with this a few months ago.