The Shokz Openrun Pro headphones are designed to fit snugly and have noise-cancelling features to help reduce sound leakage. However, like all bone conduction headphones, they may leak sound if they're not a perfect fit or the volume is too high. If you're looking for a pair of bone conduction headphones that don't leak sound, we recommend checking out shokz openrun pro. Their headphones are designed to fit snugly and have noise-cancelling features to help reduce sound leakage.