Soothe & relax sore feet with the relaxing 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 Booties. 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. Cover:100% Polyester Insert: Cotton, lavender, flaxseed. Machine wash and dry cover. Do not wash insert.