About Guitar Straps:
Most guitar straps are made from either a synthetic material like nylon, or other materials such as cotton, wool or leather. Guitar straps range in size, length, width and price, and many also feature some sort of padding as well as a way to adjust the length of the strap to suit any player.
Guitars have varying accommodations for attaching a strap. The most common are strap buttons, which are flanged steel posts anchored to the guitar with screws. Two strap buttons come pre-attached to virtually all electric guitars, and many steel-string acoustic guitars. Strap buttons are sometimes replaced with strap locks, which connect the guitar to the strap much more securely.
The lower strap button is usually located at the bottom of the body. The upper strap button is usually located near or at the top of the body, on the upper body curve, at the tip of the upper horn (on a double cutaway), or at the neck joint (heel). Some electrics, especially those with odd-shaped bodies, have one strap button on the back of the body.
Some acoustic and classical guitars only have a single strap button at the bottom of the body—the other end must be tied onto the headstock, above the nut and below the machine heads.
Other acoustic and classical guitars come with no strap buttons at all. In this case, one or two strap buttons can usually be added to the guitar, or a classical guitar strap (also called a "guitar harness" or "neck strap") can be used, which supports the guitar by hooking into the sound hole.