Our Aerial fabric is a 40 denier nylon tricot with low-medium stretch, which we believe is a superior fabric with the best of all worlds. 40 denier tricot is a lightweight, yet super strong and secure fabric. Low-medium stretch refers to the overall stretch in the silks, which is around 8-10cm per metre.
The best way to understand stretch is that if you are using silks 1m high, you will stretch around 10cm bearing all your weight. If you rig a 6m high silk, you will stretch around 60cm bearing all your weight at the base of the fabric. The longer the silks, the more calculated overall stretch at the base, lessening with height. Here is a fabulous video from Aerial Dancing explaining the differences, if you are not familiar: