Meet your perfect workout partner. No matter the workout, these tips are designed to stay put, so you have earphones that move with you. Earphones falling out? Heat activated memory foam expands to unique ear canal shape, creating a custom, secure fit for amazing in-ear retention. Music while exercising is all yours. Seals ear canal from environmental distractions. Enjoy music without raising the volume to compensate for external noise. Maximize your listening experience. Hear music how it’s supposed to be heard, with all its highs and lows. Comply Foam seals the ear canal and funnels in pure sound. Acoustically transparent filter (Only for Sx models) ensures sweaty ears are no problem. This protects your earphone from moisture damage. Specs Colors: Black Foam Height: Medium Diameter at proximal end (end attaching to device): Medium: 12.83 mm ± 0.75 mm (0.505” ± 0.030”) Materials: Polyurethane foam, thermoplastic elastomer (all RoHS compliant).