You will receive fitting instructions in a video link via email after your purchase. These videos are also available on our website on our FAQ page. These videos demonstrate how to assemble, customize fit, and make adjustments to help optimize support. There is also a QR code for fitting instructions that is included on packing slip in shipment with purchase. All fitting and adjustment instruction videos are also available on Kinetic Arm YouTube Channel. If you have any questions about fit or making adjustments please reach out to our customer support team, they will be happy to assist.