After great success with the Hurley, I decided to expand our dog's West Paw toy collection with two Zisc's. Wisconsin winters are hell on dog toys, but I've found that the Zygoflex is absolutely amazing in cold weather, and these are no exception!
Durable, they resist the cold without becoming brittle or crumbling, they fly and are easy to throw thanks to the deeper (rather than thicker) rim, and Isis loves them as much as her other West Paw toys. The moment I lay a hand on one, she's right at my feet, ears up, eagerly (and often impatiently :) ) waiting for me to throw it.
I highly recommend West Paw toys to anyone and everyone I meet...and the Zisc's are worth EVERY PENNY!