UNIVERSAL PHONE SIZE : Never leave your phone behind with the secure armband that can hold your phone with a case ON. Whether your phone is 4??or 6.5?? tall, it will hold secure and will not bounce around. LIFESTYLE DESIGN : The discreet, stylish design makes this the perfect phone holder for an active lifestyle. If you enjoy running, weight lifting, hiking, dog walking, gardening or days out at the theme park, then this Armband is perfect for you. SMALL – LARGE ARMS : Finally, a phone armband that you never have to readjust or worry about slipping during physical activity. The comfortable material hugs your arm like no other armband you’ve used before. Please measure around your bicep circumference (un-flexed) for a guaranteed fit. X-SMALL 7.4 – 8.5, SMALL: 8.5?? – 11.6??, MEDIUM: 11.6?? ?C 14.2??, LARGE: 14.2?? ?C 16.5??, X-LARGE 16.5 – 18 LIFETIME WARRANTY : Here are RevereSport we care about our customers and we only provide the finest quality sports armbands. Feel secure when you purchase knowing you are covered by our 60 Day money back Guarantee and our LIFETIME replacement Guarantee.