70%Neoprene,15%Polyester,15%Nylon Snap closure Hand Wash Only [Slimmaionix Arm Trimmers]: Work on the Body to Activate Body Cells, Detoxify, Relieve Joint Pain, Remove Toxins from the Body in a Healthy Way and Reduce Weight. It Helps to Remove Impurities from the Body, Improve Metabolism and Strengthen the Immune System. Long-term Use Effectively Removes Water from the Body. [Self-heating Wormwood Arm Trimmers]: Create Sensations of Heat Without Preheating or the Need for Electricity. Accumulates Heat from Your Arm and Keeps It Warm Without Escaping Outside. [Arm Shaping]: Increase Your Biceps and Triceps Muscle Temperature, Stimulate Sweating,improved Blood Circulation, Accelerate Calories Burning, Make Your Arm Slimmer [Perfect Fit]: Adjustable Magic Strap, Easy to Make It Tighter or Looser,which Perfectly Fits Your Armyou Can Wear It Anytime, Whether It is Running, Cycling, Dancing, Weight Training, Fitness, Rope Fighting, Gym, Yoga, Walking, Etc. [Multi-use]: You can wear the arm band at home at work or at the gym for weightlifting, strength training, hiking, basketball, tennis, golf, waiting, etc. The arm trimmer will make your arm muscles more efficient during exercise.