The Vortex Optics Sheltered Wings Harness Strap (SWVTHARNESS) allows you to comfortably carry your binocular anywhere for hours. It balances the weight of your binoculars on your shoulders and not your neck. The strap keeps your binoculars and rangefinders from jostling around when you walk. It keeps it close to your chest. The strap is made of nylon/lycra which is a durable material to allow easy sliding into viewing position. It's fully adjustable and one size fits all, so different users won't have a hard time using the product.