1. 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.2. FIT FOR MOST HEAD CIRCUMFERENCE The hot treatment cap has an elastic rim, fit for most heads circumference.3. ECONOMIC AND SAFE This thermal hair cap can be simply washed with warm water, avoiding soaking it in water directly. You can easily make a hot compress to your hair at home, which will greatly save your time and money.4. EASY TO USE It does not need 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), increasing by a few seconds if it’s not warm enough.