Biologique Recherche Cryo-Sticks work during treatment to soothe the skin and relieve redness by providing local cooling. Cryo-Sticks are made of stainless steel and have a significant thermal capacity and conductivity specific to this material. At low temperatures, stainless steel has the property of storing thermal energy in relation to the cold. Stored in the refrigerator or in ice, Cryo-Sticks therefore store a maximum amount of cold, guaranteeing the spread of the cold in contact with the skin during the treatment. In addition, their ergonomic shape conforms to the contours of the face, allowing them to work effectively on every zone. Best used in combination with Masque VIP O2 or other Biologique Recherche Masques.