Amazon.com: Insole Foot Warmers - Long Lasting Safe Natural Odorless Air Activated Warmers Instant Warm Up to 8 Hours of Heat - Disposable Heating Pack for Skiing, Winter Hunting - 16 Pairs
Amazon.com: HotHands Insole Foot Warmers - Long Lasting Safe Natural Odorless Air Activated Warmers - Up to 9 Hours of Heat - 16 Pair , Black : Sports & Outdoors