So I get very vocal when something actually does do what it is suppose to do and really delivers. Und die Blinkfunktiin der Sohle ist natürlich der Hammer BUYER BEWAREUnlike anyone else I actually NEEDED this to replace the one that came with my headset. With the deals on this power block, I have 3 total. Im normally as size 8. So easy to get in and hooked! Obviously, some feet will be in between the sizes available. Starting at the bottom, the bass is nice and deep but its not boomy or muddy. I loved these shoe shelves! The only downside to them is that the velcro straps are extremely long (like other reviewers had mentioned).