Please confirm the circumference of your upper arm with a ruler before purchase. 

• Curved, breathable ergonomic design for maximum comfort.
• Light, thin, smooth minimalist design, easily conceivability.
• Adjustable band for all different arm sizes.
• 10cm-20cm armband (Adjustable for kids and adults).
• For kids and teens, the wearable circumference is 13cm-20cm.
• For adult, the wearable circumference is 24cm-40cm.