1/ Universal Sports Arm Band for Phones with their cases: Fits 3.5'' to 5.1'' cell phones (such as iPhone 4s, 5/5s/SE, iPhone 6/6s/7/8), with all cases such as OtterBox Defernder cases. Also fits iPhone X with Otterbox Commuter cases, and Samsung Galaxy S8, S7, S6, A5, A3 with slim cases on. See Product Description below for more compatible smartphones and cases. 2/ Premium Quality Materials and Universal Arm sizes: Made of Ultra lightweight, stretchable, soft skin-friendly, breathable Lycra and neoprene. Also, hand washable, water resistant, sweat proof and eco-friendly. Grip with compatible keeps the band firmly on your arm during at gym, workouts and running. So you can focus 100% on your performance comfortable. In addition, two dual-slot adjustable Velcro will fit arm size from 9'' to 16''. 3/ Reflective stripe for safe running in low light conditions. Built-in reflective stipe around the transparent window, provides the visibility in low light condition and keep you safer when running or walking at night or in the early morning.

THE BEST ARMBAND for YOU:This Armband is specially designed for iphone 8 plus/iphone 7 plus/iphone 6 plus(5.5 inch),big enough even you put your Phone with protective case in it.Offering full screen protection and allowing easy access to your phone's touch screen and headphone jack.If For any reason You Do Not Absolutely satisfied with this Armband, Just Return Or Replace It SKIN-FRIENDLY: Made of high-grade Water-Resistant Lycra fabric, soft, stretch,lightweight, sweatproof. The premium fabric is super grasp and it will not fall down your arm even during a intense exercise. FIT FOR MOST ARMS:This Running Armband is Built in two regulating slots to make the armband adjustable fully, and enough to fit all small and larger arms from 9"(23cm) to 14"(36cm), with the extra Extension strap , allows further lengthening of 8.85 inches (22.5cm) if required.