First, our bands are made of highest quality 100% genuine eco-friendly latex (not rubber bands which are much cheaper and tend to break easily). They are stronger and able to stretch further. You will feel the same resistance after many reps.
These bands are free of non-natural materials such as Thermoplastic Elastomer (TPE). TPE materials cost 30-40% less, are not gentle to skin, and are much less durable.
Moreover, our bands are comfortable, soft and easy on the skin. The only way to achieve that is to let the latex rest for a long time in tightly controlled temperature and humidity before making the bands.
Both of these involve a higher investment for us but we think it's worth it to create a better product.