Sennheiser IE 300 are premium in-ear headphones, built with an enhanced transducer housed in an extremely comfortable earbud, letting you enjoy high-fidelity audio experience wherever you are. IE 300 Design Sennheiser's IE 300 in-ear headphones have been designed to achieve a full and natural sound on the go. To do this they are powered by an updated version of Sennheiser's 7 mm Extra Wide Band (XWB) transducer to delivers a balanced and improved sonic accuracy, which is housed in a specially developed in-ear styled earbud. Extra Wide Band Transducer Every component, for the Extra Wide Band (XWB) Transducer, has meticulously been tuned to optimise the sound quality. Such components include an advanced membrane foil that reduces natural resonances and total harmonic distortion, a transducer back volume developed to reduce reflection within the housing, and a resonator chamber that removes masking resonances in the ear canal to provide detailed a treble response. Is the Sennheiser IE 300 Comfortable? The IE 300 earphones offer superior comfort and durability. Each earbud has an adjustable flexible ear hook, which comes with silicone and memory foam ear adaptors, available in three sizes (S/M/L). Not only do these offer a perfectly secure fit, but they also isolate noise for a better sound. Flexible and High-end Cable The IE 300 earphones is supplied with a replaceable 3.5mm cable that is reinforced with para-aramid for stability, even after thousands of bend cycles. A high-quality gold-plated Fidelity+ MMCX connector is used, and is seated in a recessed, 4.8mm-wide socket in the housing.