The slides arrived damaged. The sound quality that this microphone gives is astonishing. I used a wire, turned on and off bass boots, turned on and off anc (active noise cancellation) and turned on and off the headphones several times. Monster delivers again! I wear it when Im doing back/arms & or squats but also lower, I remember while doing calf extensions (bcuz Im over the 200+lbs mark), like something was pulling a lil in my back BUT. Very smooth and stretchy material. The threads were all bent and lapped over so I couldnt even put it together. As always with Birkenstock the quality and comfort of theBought these as was being moaned at when on conference calls as my colleagues could hear me typing with my standard handsfree earphones. For my 6 hook rack Id worry 6 heavy coats might pull through the 2 holes in the MDF (they are inset 7mm in a 9mm thick back), still it looks quite solid enough, though Id use 4 if gong for heavy loading. I ordered my normal size, and theyre so comfortable.