You wouldn't want to use them while doing anything energetic – they're big, though they do fold for storage – but these Bluetooth Sonys benefit from excellent sound.
They would be ideal for long-term wireless listening on a long trip. Plenty of bass weight and fine midband/treble detail set them apart.
Sony DR-BT50 Bluetooth review
These Sony Bluetooth 'phones would be ideal for long-term wireless listening. Plenty of bass weight, and fine midband detail. Tested at £130.00

What Hi-Fi? Verdict
Good sound - ideal for long-term wireless listening on a long trip.