Lightweight and Portable: Our Knox Gear earphone case is designed for mobility and easily fits in your pockets, bag, gym bag, or luggage without damaging the earphones, making the pocket-sized protective case travel friendly. Advanced Safety: The Knox Gear earphone case protects your in-ear headphones from shock and impact; the waterproof lining provides weather protection, and the microsuede lining prevents your earbuds from tearing and provides further protection. Compatibility: Our pocket-size earphone case is compatible with Sony WF-1000XM4 Noise Canceling Truly Wireless Earbuds and can also be used with most wired in-ear headphones, bluetooth earphones, and earbuds from Sony, Samsung, and other major brands.