My favorite feature on warrior pads has always been the nylon knee cradle. Rotates so much better than anything else, doesn't under rotate from your knee gripping too close to the back of the pad, and you never fall off the block because of the sling wrap knee. Now with companies moving towards a flat boot channel warrior is one of the few (so far) to keep it even if it is subtle which I love because it helps center my pads and allows less thigh rise interference. And with G6 the shin pillow makes the pad feel almost more connected than my EF5s.
However I think I've said it here before but I have no idea where, at this point every manufacturer has a very very similar leg pad. In most cases the deciding factor is the glove and warrior is still one of the best.
Judging by the fact is has a wrist strap I'm betting it's just normal 580 strapping.