The ultimate luxury….toasty feet! Herbal Booties are made of ultra comfy polyester suede & cozy shearling. Warm or cold therapy provides soothing relief from strenuous exercise or from an average day’s pounding. A physician formulated blend of 12 soothing. aromatic herbs and 100% natural grains retain heat to keep you warm. relaxed & comfy. One size fits all. Microwave for instant heat therapy or chill for instant cold therapy. Feature: soft & cozy fabric heats in microwave in minutes great for active people with sore. tired. aching feet 100% all natural herbs & grains in sole of Bootie long lasting. penetrating warmth perfect for sore. tired feet chill in freezer for cold therapy