I ended up making two pairs of these... My first pair, pictured here, out of Buffalo and the second pair out of Elk.
The Buffalo worked GREAT!!! no trouble with traction or stretching, even in damp grass, mud, rain...
The Elk, on the other hand, stretched out a bit just walking in the fresh, dew covered grass. They didn't stretch out
to where they were un-wearable... but they did stretch.
If you have a choice between Buffalo and Elk... Choose Buffalo.