"Every set of SoloTops is thoroughly post-processed to ensure maximum material strength. Even though I try my best to ensure every set of Solo Knit Band are perfect, they are fdm pla+ 3D printed and may show mild surface imperfections, but rest assured this does not affect the functionality of the product. The Solo Knit Band adapters for the compatible with Apple Vision Pro allow you to use an additional compatible with Apple Solo Knit band to create a top strap band while retaining the sleek look of the compatible with Apple Vision Pro's original design (This is an expensive headset afterall!). This significantly improves the comfort of the headset due to weight distribution being shifted more from the front of the face towards the top-center of the head. Thanks to compatible with Apple's Solo Knit band having a convenient dial on the side, you can quickly and easily adjust the vertical height of the headset relative to your eyes. It's highly recommended that a size SMALL compatible with Apple Solo Knit band is purchased for use with the SoloTop. Any other size has not been tested and will likely result in a sub-optimal experience. installing the SoloTop adapters is as easy as removing the Solo Knit back strap, unplugging the power cable from the headset, sliding each SoloTop adapter onto the left and right bands, and then installing the Solo Knit straps back onto both the SoloTop adapters and Vision Pro side straps. This is the same product as BigEarsTV, search for his videos to see him explain this product! package include: Adapters*2 "