DESIGNED FOR THE IPHONE X / 10This is the most secure, lightweight, water blocking armband on the market, designed to hold your iPhone so you don't even notice you have it with you. The lightweight material creates a snug No Bounce extra secure fit!!FEATURES WATER PROTECTION: Run in the rain and sweat hard in the gym knowing your phone is protected. (Not for Submerging) UN-RESTRICTED ACCESS: Unlock your home screen without removing your phone SUPER GRIP: The Lycra material is soft and will Not ride up when you train NIGHT REFLECTOR: Bright reflectors strips to keep you visible KEY POCKET: New larger key pocket to hold all key sizes including car keys / fobs CASH / CARD POCKET: Extra pocket to hold cash, credit cards and ID MUSIC ON THE GO: Easy access headphone ports for the iPhone XCOMPATIBLE ARM SIZES WITHOUT EXTENDER STRAP: Small 9" - Medium 13" WITH EXTENDER STRAP (Included): Medium 13" - Large 17.5"COMPATIBLE PHONE IPHONE X / 10 IPHONE XSCOMPATIBLE PHONE CASE SLIM CASE ONLY (Not cases like Otterbox / Lifeproof) MAX OVERALL CASE SIZE 5.8" x 3"WARRANTY 60-Day Money Back GUARANTEE Lifetime Replacement GUARANTEE***To claim a FREE replacement as part of your Warranty, select this item on ?Your Orders? via your Amazon account, then select ?Contact Seller.? ***