Get it here for free if you already own a XR Elite
https://htcvive.co/4b7wu2S

Here's what it comes with
VIVE Face Gasket 2.0 for XR Series: Snug, smooth, and suited for full immersion in virtual reality. It provides even pressure distribution and a velvety texture while minimizing light leakage.
VIVE MR Gasket for XR Series: This sleek alternative to the default face gasket offers better ventilation and a more complete view of your surroundings, perfect for mixed reality experiences.
VIVE Deluxe Strap for XR Series: A back-to-front top strap that helps distribute weight between the headset unit and battery cradle. You can adjust it for optimal balance during standalone and PC VR gameplay.
VIVE Temple Clips for XR Series: These left and right temple arm clips secure the headset-to-battery cradle connection, providing added stability while wearing the VIVE XR Elite.