DEEP CONDITIONING - The flaxseed inside retains heat evenly, The heat can promote ingredients to penetrate the hair follicles more efficiently, leaving your hair snug and soft, and promoting healthy hair growth. FIT FOR MOST HEAD CIRCUMFERENCE - The hot cap has elastic rim, fit for most heads circumference. QUALITY MATERIALS - Premium flaxseed materials, which can retain moisture well and re-warmed. Outer material consisting of microfiber cotton and nylon, soft and comfortable. ECONOMIC AND SAFE - This thermal hair cap, simply Wash with warm water, avoiding soaking it in water directly. You can easily make hot compress to your hair at home, which will greatly save your time and money. EASY TO USE - It is not need for electrical outlets or batteries. It is warmed up by simply placing it into the microwave for about 1~2min (30 seconds for the first heating), increase by a few seconds if it's not warm enough.