They do not lose their elasticity at all after I used them for many times.
These bands are great! I was using regular elastic bands for my workouts and they kept slipping and twisting on my legs. It was so frustrating! I had to keep stopping to adjust them and it was wasting so much time. These bands are wonderful! They stay put and offer great resistance. I am so sore from using them, but in a good way. I highly recommend them. Plus they are beautiful colors.