Comply NR-10 earphones were engineered to maximize noise reduction, effectively blocking more noise than the leading noise cancellation earphones; even earning an amazing Noise Reduction Rating (NRR) of 29dB Combining extreme noise reduction and a compact design make these earphones the perfect travel accessory. Additionally, they feature Comply Foam Tips which provide super soft comfort and a stay-in-ear fit for today¿s active lifestyles. The included Comply Foam Tips are made from unique breathable memory foam that is activated by body heat and becomes ultra soft, reducing irritation and fatigue. Once inside the ear, this foam will expand to create a seal, funneling pure sound into the ear canal, enhancing the listening experience. The comfortable seal allows music to be enjoyed without raising the volume level to compensate for external noise. The gold-plated 3.5 mm plug works with most portable music sources (iPod, Zune, etc), CD/DVD entertainment systems, laptop computers and gaming devices (Sony PSP, Nintendo DS, etc). The integrated slide control makes it easy to adjust volume levels quickly and easily. Each NR-10 earphone comes with 1-pair standard-size and 1-pair slim-size Comply Foam Tips, plus a deluxe travel case with storage for extra foam tips.