ThermoBall MicroBaffle Bootie II (The North Face, $62.90)
These shiny booties are crafted with IcePick temperature-sensitive lugs to keep your feet warm no matter the climate. So when you go from trekking through snow to your heat-blasted fifth-floor walk-up, get ready for your sweaty feet to demand you do a panicked strip of these shoes cause you’re way too hot now. Hello, feet!