I have recently ordered sparkfun
The structure of the fabric is more like a rib than Lycra. The front side is very shiny and you can see the rib structure from the back side.
It stretches very well on once direction but not at all for the other.
Here are some pictures comparing Sparkfun conductive fabric (left) and LessEMF stretch conductive fabric (right)
When measuring resistance over 10cm2 fabric, the sparkfun conductive fabric (left) measures less than 1 ohm/10cm2, while LessEMF stretch conductive fabric (right) measures 2ohm/10cm2.
This post is not to compare which is “better”, but to understand the difference so you can pick the suitable one for your project.
When you use MedTex180 for fabric traces, you have to be careful which direction you are cutting the fabric, and which direction the trace needs to be stretchy.
I used MedTex180 for Solar T-shirt II project and it worked wonderful.