【Warm Slippers with Pockets】 Size: Free (23-25cm) Warm them up in the microwave and enjoy instant warmth! These cozy slippers have pockets to hold gel packs. ・Includes 2 gel packs ・Simply heat in the microwave for about 15 seconds ・Gently warms your feet ・Recommended for cold seasons and combating cold feet Perfect for home use or as a gift ◎