Armband, Liger Sweat Proof Armband Case + Key Holder for iPhone 6S (4.7") ADJUSTABLE: Built in two regulating slots to make the armband adjustable and suitable for most people. Option A: 12.0-14.0" [30.4-35.5 cm] or Option B: 8.0-11.5" [20.3-29.2 cm]. And what's more, a 27.5cm long extension strap is provided for any giant bicep! SWEAT PROOF Truly improved version from sweat proof material of Liger is sweat-proof. CUSTOM designed for iPhone 6, the port on armband exactly suitable for the audio port, more convenient than others. COMFORTABLE: Made of lightweight, breathable neoprene and Lycra material makes Liger soft and durable to provide comfort and protection that wicks, breathes, dries quickly and is easily wiped clean. SAFETY With the silver reflective strip encircling your protective screen, when you have the night running along the road, Liger armband provide better visibility and enhance 'Jog Safe' precaution.