My first attempt at Chacos were the double strap. I currently have to switch off the circuit breaker and the inverter to get the refrigerator to turn off, and two other outlets (one a GFI) go off with it. So, I would say the sizing runs a tad small but I get confused with all the different sizing. Es kann eine ziemliche Fummelei werden bis man das Ganze befestigt hat und ich habe mir dabei noch ein Schraubengewinde kaputt gemacht weil man ja die "Mutter" hinter dem Plastik nicht richtig sieht. The top and the bottoms are both long, so if you are taller than me, you wont have a problem. Wont charge. This product at all ended up throwing away Perhaps if I was knowledgeable in tuning an overclock manually, I could have better luck with the higher clock speeds these sticks are rated for. I have had these headphones for a few days now and I have been using them frequently so I can provide a proper review. These headphones are absolutely amazing, especially for the price!