Anti-Theft Pack Armband Bags Lightweight Running Armband Pack Elastic Breathable Adjustable Reflective Strips Sports AccessoriesFeatures:1. Breathable: Ice silk fabric, skin friendly elastic fit, breathable material.2. Large capacity: It can be installed with a large screen mobile phone within 8 inches, and can be installed with mobile phones, bank cards, change and other small carry on items. Elastic and breathable.3. Equipped with earphone holes: With reinforced earphone hole design, you can listen to music while exercising.4. Easy to use: Small in size and light in weight, designed specifically for exercise, allowing for more freedom of movement.5. Safe use: Reflective logo, reflective design, and night reflective vigilance.Specification:Origin: Mainland ChinaModel Number: Sport Armband BagProduct Material: Cow Milk SilkProduct color: black, gray (optional)Size/cm S M L XLPerimeter 21 24 27 30Length 19 19 19 19Suitable for arms 20-23 24-27 28-32 33-40 Note:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!Please allow 1-2cm measuring deviation due to manual measurement.