https://www.cnet.com/news/sennheisers-newest-audiophile-headphones-will-coddle-your-ears/

I like the Sennheiser HD 660 S headphones a lot. They sound clean, they're extremely comfortable and as high-end headphones go they're pretty affordable at $500, £430, AU$799. The HD 660 S model looks like a near twin of Sennheiser's older, and still available, HD 600 and HD 650 headphones, but the HD 660 S' driver is different; it's more similar to the HD 700's driver. Sennheiser isn't breaking new ground here, it just keeps refining the formula.

The HD 660 S open-back headphones won't do a thing to hush external noise, but they are substantially lighter than the average over-the-ear design, weighing 9.7 ounces (260 grams), and even though they're high-impedance (150-ohm), Sennheiser claims the HD 660 S can be enjoyed with portable devices and smartphones.