The material is waterproof and high-quality vinyl - a departure from my usual leather harnesses. The center (between the legs) strap snaps instead of buckles at the back, which means that its tightness is limited, and it sits very high on the hips. The O-ring limits the size of the cock you can use with it, since the opening in the front panel is only 1 3/4". Most cocks will be fine, but if you're a little bit of a size king (like me), this might not be your harness.