You put on half and twist the rest on. Not sure if it's my German heritage or Polish ingenuity but it's rather easy. I had to take mine off to check the authenticity of mine so I hope someone else finds this information useful.

If you have prejudices against closed headphones, Sennheiser's Momentum is a model that can really open your ears. Literally. The most obvious difference between headphones

Full-bodied and engaging sound

Not foldable

While $300 is a lot to spend, you get a lot for it. Among true wireless earbuds, it's tough to top the sound quality, controls, and fit of the Sennheiser Momentum True Wireless.

Great sound quality; Solid connection

Price; No foam tips; Isolation

If you've stepped into an audio store of any kind, or the headphone section of a big box store, you know the name Sennheiser. The first "real" headphones I bought were Sennheisers. I used them until the pleather on the cups cracked and started sticking to my ears (they were on-ears).

Build quality and aesthetics; Sound quality; Angle cable end

Overly large case; Small earcups

Sennheiser's new headphones are more than just good-looking, they're downright sexy. Maybe it's all the brown leather, but the Momentums seem to be steeped in that same, oddly masculine brand of cool that hovers like a halo over the best gear from 30 or 40 years ago.

Fantastic sound with superior isolation; So compact, so comfortable; High price is actually reflected in the build quality - a rarity among style-minded consumer headphones; It wouldn't surprise me to see a photo of Steve McQueen wearing these, along with a Tag Heuer Monaco, a cashmere turtleneck...

Kostspielig; Not as compact as truly mobile-minded headphones; Not for vegans; Case is too bulky to throw in a carry-on

At nearly 300 USD, the Momentum True Wireless are not a cheap, throwaway pair of wireless earphones. Do they sound like a 300 USD product When compared to top performing wired earphones in that price range, no, not entirely.

Feature set (Transparent Hearing esp.) – Refined tune – Amazing connection strength through obstacles

Will only pair with one device at a time – Underwhelming battery life – Touch controls are a mixed bag

In-ear headphones are capable of awesome sound, but you might not be aware of that if you're used to hearing music through the cheap sets included with your smartphone. Even a slight step-up in headphone quality can nab you a set that can achieve ideal sound isolation from the outside world.

Headphones, headphones, headphones. There are so many of them, and they all sound totally different. If you're planning on buying headphones, then this must surely be the worst bit - deciding which set to get.

Sound lovely; good balanced mid-range; powerful bass; never too much treble; comfortable

Expensive; won't suit audiophiles

Sennheiser has a long, established history of producing quality audio products and its MOMENTUM over-ear headphones are no exception. Wrapped in a stylish, minimalist design, the Sennheiser MOMENTUM headphones boast serious audio and all-day comfort.

Expensive

Sennheiser's on- and over-ear Momentum models have been highly praised for successfully combining form and function, bringing Sennheiser audio performance to the style-focused headphone segment.

Lightweight and comfortable design; 3-button Android remote available; plentiful bass and solid overall performance

Midrange is a bit recessed