You visit a bra testing facility where a very attractive employee explains and shows you the process of bra bouncing resistance testing on two different bra models. Each bra undergoes a vigorous shaking and bouncing test while worn on her natural big breasts. Only the bras that don't let the nipples escape make the cut. This time, one model is successful, and one fails the test!

Video contains showcasing, explanation, and testing footage of bouncing and shaking at 1/2 speed - as shown in the preview.