The triple-hardened construction helps resist stretching and yellowing for durability, while the ergonomic closed button design protects against dust and dirt accumulation. This SaharaCase silicone case has a formfitting, lightweight design for easy application, and a carabiner clip attaches easily to bags.Designed for use with Sony WF-1000Xm4 headphonesFor a proper fit.Triple silicone materialEnsures reduced stretching and yellowing and protects against dirt and scratches.Form-fitting designEnhances portability and simplifies installation.Carabiner clipAllows you to quickly and securely attach your headphones to your bag, jeans, and jacket.