Feature: - Self-heating.good for Cold Weather. - Shapes & Tones Legs.works Best when You Wear It Overnight. - Accelerate Metabolism & Improve Digestion - Removes Odor-causing Compounds. - Performs Static Massageon the Soles of the Feet to Relieve Fatigue and Relieve Sore Feet. - Dense Siliconehot Spots, Comfortable and Warm to Wear. - Multiple Benefits: Be Used for a Range of Conditions Such As Weight Loss, Back Pain, Headache, Fatigue, Anxiety and Stress. - Great for Outdoor Activities: Skiing, Snowboarding, Hiking, Hockey, and Other Sports. Specifications: Material: Tourmaline,polyester Cotton Color: White, Red, Black Effect: Anti-fatigue, Keep Warm, Cold Resistance Massage Socks: Health Care Socks, Non Slip Skid Socks Package Include: 3/6 Pairs* Alvo Feet Tourmaline Slimming Health Socks Notice: 1. Due to the Lighting Effects and Shooting Angles, the Color of the Item and That Shown in the Picture Might Have a Nuance. 2. if the Heat Caused by Prolonged Use or Improper Maintenance Cannot Be Released, Please Put the Heated Socks Under the Direct Sun to Recover. 3. Heat Socks Need to Be Washed by Hand and Washed Quickly, and Cannot Be Soaked in Water for a Long Time (to Prevent Damage to the Heating Point). You Can Wash Them with Alkaline Soap.