These are really bright purple not blue. Pulled stack of weights no issues. 9 hours or so of use seems about right. habe Ersatz für kaputten HDR 145 gebraucht. The noise is muffled, but not really isolated or cancelled out. I would personally suggest another manufacturer. I cant believe this is even remotely highly rated. Not the quality I remember, think they changed the design, not as comfortable as once were. When tight, snug them up with just a little bit of torque. The company never refunded the money.