Contains 20 pair of foot warmer insoles. Provide instant heat for up to 5 hours. Air activated-generate heat fast * All natural ingredients, safe, no odor. No batteries, no microwaves, no fuels * M/L fits Women"s 9+, Men"s 8+ * Great for cold weather activities like hiking, camping, ice fishing, etc. * LITTLE HOTTIES WARMERS are used by athletes, sportsmen, skiers, construction workers and anyone wanting to stay warm during outdoor activities