Sennheiser came very close to creating the perfect running headphones in the form of the SPORT True Wireless. The open/closed ear tips system is not without flaws but offers more versatility than standard true wireless earbuds.
Exchangeable ear tip design allows for multiple listening modes, Secure fit thanks to wing tips, Lightweight (6.8g per bud), IP54 rating, More 'naturtal' sound than ANC-enabled buds
Charing case is too bulky to sink in your pocket, Admittedly, continuously changing ear tips is a bit of a faff, Space for extra ear tips would be nice in the case, Level of passive noise cancellation might be a bit much for some