As far as I am concerned, the OP needs to be clearer about "need to walk in them". My 3-velcro Exustar are relatively comfortable for walking short distances, meaning that when I get off my bike at work, I can comfortably walk my bike to the cage, comfortably walk 200m/yd to my office before I change into regular shoes and at Costco or the grocery store, I can wander around the store in those shoes getting the stuff I need. However, if the OP means that when the OP (fictitious scenario for the sake of example) gets to the university, locks the bike, goes to classes for the day, returns to the bike and bikes home, etc., then no, the Exustar and most other MTB shoes would not be comfortable and for that amount of walking, I'd carry a second pair of shoes.