I would like to buy a pair of good noise isolating, bluetooth headphones, closed back for outdoor work (operating tractors and mowers). Having active noise cancelling is fine, but I need the "heavy lifting" to be done by the closed back and ear pads. They also will be exposed to the elements, dirt, sweat, and sunscreen. I've seen and listened to the 3M Worktunes, which are fine, but they don't sound the best. I'm willing to spend up to $500 for the right cans, but given what I'm doing with them, I'd rather go a little cheaper. I prefer a neutral to warm sound, with good bass (not overblown). Thanks for any help you can provide!