Keen Men's Zionic ADV Hiking Sandal - Monochrome / BrindlePart hiking shoe, part sandal, the Zionic ADV takes the stable design of Keen's Zionic trail shoe and combines it with breathable mesh (and a few cut outs) to create a prime slice of summer footwear. Those abrasion resistant mesh uppers keep the weight down without sacrificing strength, while that inner sock lining means they're particularly comfortable. If you like the feel of open air sandals but need a bit of extra protection out on the trail,