My French is very weak, so I translated this literally: "chicken's nest." I asked the folks at Urbana (they're in Montreal) what it means, and it's the French idiom for pothole. The idea is that tire effortlessly rolls through potholes; the design and name of this tire was "inspired by our crumling infrastrucure here in Monteal," according to Urbana.
The recommended pressure for this tire ranges from 20 to 40 psi. At a low PSI these look like they would float fairly well on deep snow, though the slicks might be less than ideal. I'll try these on the beach in Santa Cruz to see how well they roll.
Watch for a first look of the Urbana bicycle coming soon at Commute By Bike.