Note: Please measure the size of your backpackvest before purchasing our shoulder strap protectors. To ensure they fit your backpack. Lightweight and Breathable: The shoulder strap protector is made of nylon with a PU coating, making it waterproof. With a breathable mesh layer to help dissipate heat. Secure Fit with Velcro Design: These shoulder strap protectors are designed with an openable Velcro, allowing for easy attachment and removal. They fit most shoulder straps measuring 2' up to 2.6' in width, suitable for a variety of vests, bags, seat belts and more. The internal hook provides friction to prevent unwanted movement along the strap. Versatile Attachment Options: The central attachment point is elastic, while the ends have a nylon webbing. This allows you to easily attach and access various items you may need during your activities.