【Dual Stage Lock，Strong, secure mounting mechanism】Built-in magnetic attachment and lock technology is ultra secure. The dual-stage lock means that your iPhone sits slightly raised from the armband, so there is no friction between your arm and the iPhone. What's more , no matter how fast you move those arms, your iPhone will stay secure.
【 Anti-slip Silicone Strip 】Hold your phone holder tightly on your arm.
【 Quick & Easy to Attach/Detach】 The simple twist and lock makes it easy to attach / detach your iPhone. Attachment/detachment is instant and 1-handed
【Sutiable & Adjustable】The armband is fully adjustable to fit any arm size between circumference 235mm - 425mm.
【Cozy & Comfortable】Made with stretchy Nylon Lycra, the Sports Armband fits comfortably and securely onto your arm or over activewear. Four ventilation holes with effective sweat wicking ability, so your arms won't feel stuffy in fast running.

Need Work with All Lock Airbag Case (Not Included) for iPhone or All Lock Universal Phone Snap Adaptor (Not Included)