... 4.Hot and cold use,Free sample PVC eye mask,Gel eye mask,Cooling eye maskMaterial:0.25mm PVCsize:20.5*5cmOEM and ... pack flat in freezer for at least two hours.--hot compress: alleviate rheumatic pain, neural pain, sciatica, vertebral pain, ... improve mucous membrane scar after surgery--cold compress: physical therapy for traumatic hemorrhage, heatstroke, itch, headache, strain ...