(Image credit: Apartment Therapy )
Mini Hottie Hand Warmers by NPW • $7/each • Creative Kidstuff

I saw these small hand warmers by UK-based company NPW at NYIGF last week and thought they'd be perfect to take along for a day of sledding (if we ever get snow here in NYC that is). By snapping a disc inside, the mini mittens heat up within seconds. They're reusable after boiling in water.