With all the latest advances in Digital Music and Sound fidelity, should you be using those Headphones that came with your portable MP3 or CD player? Here's a way to get the best possible sound - The Sennheiser Way. The Sennheiser PXC 250 is a closed, dynamic, supra-aural mini Stereo headphone with NoiseGard active noise compensation. Due to their active and passive attenuation of ambient noise, they let you enjoy music even in noisy environments. The headphones are foldable and come with a convenient belt pouch, making them an ideal travel companion.