Comply Premium Replacement Foam Earphone Earbud Tips - Sport S-500 (Medium, Black, 2-Pair) The original foam earphone tips. Made in the USA using proprietary memory foam materials for the ultimate in ear headphone upgrade Sport replacement eartips are made from durable, rugged foam and engineered for a stay-in-place fit. Keep your sports Bluetooth wireless earphones in place while working out or running even in the presence of sweat or moisture Super-soft memory foam reduces earphone irritation and fatigue. Comply foam tips are 2x softer than silicone tips so you have the most comfortable earphones Body-heat activated foam adapts to ear canal and provides a perfect seal. Limits outside noise for a superior audio experience and enhanced bass 4 models (100, 200, 400, and 500) to fit all major earbud brands. See compatibility chart here: Complyfoam.com/Compatibility