B BELK iphone 8 7 6 6S Sports Armband, Premium Flexible Stretchy Silicone Running Armband, [Reduce Shakiness][Adjustable Strip][Key/Card Slot] Open Design For Running/Fitness Activity PREMIUM DURABLE MATERIALS:Made of high quality lightweight Silicone. Has fine and smooth touch feeling ,flexible and stretchy, very comfortable,highly resistant to sweat and moisture, keep the armband firmly on your arm during workouts and running. ADJUSTABLE AND COMFORTABLE STRIP:Strong and soft adjustable arm velcro strap, protects and stabilizes your phone firmly on your arm. You don't need wrong slide down when you running,dancing or other sports. SIZE & COMPATIBILITY:BELK durable silicone sport Armband will Fit Arm Size Up To about 4.8 inch.Compatible with Cellphone up to 4.7 Inch.Perfect for iPhone 7,iPhone 6,iPhone 6s.You can easy to carry with no more burden when doing sports,Like running, workouts, cycling, fitness, or any activity outside. PRODUCT DETAILS:Bulid in Card Slot - Card space reserved, Easy to carry for sports/shopping;Hiding key slot design - Secret compartment stores your house key while exercising;Open design - You can easy access to your phone's screen,the headphone port and controls. B BELK Silicone ArmBand use damper winding as the surface meterial contact with the arm skin - Reducing shakiness during sporting,prevent sweat without excitant,enjoy excercise freely.If there is any problem,please contact us without hesitate.