I've been wearing snowmobile bibs forever, but I'm finding it harder to move around in them, too stiff and heavy, I don't walk well and I'm looking for something lighter and not so stiff, it's also important to have well padded knees and zippers that go all the way up the leg. I was able to try on a pair of Striker Predators, WAY too heavy! I've seen some deals on Clam extreme, anyone have experience with these? THANKS!