Soothe & relax sore feet with calming lavender scent & moist heat. Use on their own or indulge further by liberally applying Sonoma Lavender Foot Balm to your feet, insert first into a plastic bag and then into our warm Footies. A relaxing spa treatment at home! Heat in the microwave or tumble dryer; or chill in the freezer! The ultra-soft covers can be removed and thrown into the wash. One size fits all up to ladies size 10. NS4001 How to refresh? Our 100% pure, lavender, Essential Oil is a perfect addition to your purchase. Add a couple of drops to the insert and massage in. We offer it in a 10ml bottle or a 30ml glass spray bottle: Lavender Essential Oil | High Grade Lavender Oil Spray | 30ml Glass Bottle How to warm? In the microwave on a rotating carousel, 30 second increments not to exceed 1 minute. Or, warm in clothes dryer for up to 6 minutes. Cover may remain on. How to chill? Place in a plastic bag and put in freezer for 30 minutes or more.