"Loving the shoe's versatility and ease, Kristin Sluyk, a travel professional with The Decker Royal Agency, can’t say enough about the Wool Runners from Allbirds, which, while not technically a slip-on, are easy enough to take on and off (I'm a fan of them as well). As an Ayurvedic yoga teacher, she’s also keen on a sustainable product. “The shoes can be dressed up or down and are so flexible that they practically pack flat if needed.” Another perk: The sneakers are machine-washable."