This is going out to all you experts who know a thing or two about buying hiking gear, cuz i haven’t a clue! I’m looking at Chaco’s and found some brand new super cheap ones on Ebay, but the thing is they dont have a heel strap. How crucial is a heel strap for keeping the shoe on your foot? Is it even worth considering, or should i just suck it up and pay $100 for them at chaco.com? Any opinions would be a huge help. Thanks!