The overall result makes heavy binoculars feel lighter than they really are. The strap is washable and durable. These comfortable straps are available in a choice of bright colors, or you can choose basic black. I find the brightly colored straps are easier to find in the typical birder's car that is often filled with food, clothing, maps, field guides, and a large assortment of miscellany. Another important feature of straps is the ability to adjust the length to match your specific needs.
Birders come in different heights, and different body types, from thin to rotund.
One fixed length of strap cannot be the correct length for all birders. Straps should be adjustable to compensate for the differences in people. It is common to see many birders, particular shorter people, with straps that are far too long. Binoculars should rest on your chest. If the straps are too long, they rest on your belly.