Armband Compatible With iPod nano 4th Generation (fits iPod nano 4G) Ultra slim, lightweight, comfortable neoprene armband fits 4th gen iPod nano (will not work for 5G nano) Hidden pocket holds key or money; Securely stores and manages earphone cord Clear, protective window cover with full navigational control Holds 4th generation nano right side up or upside down to read screeen easier on arm Adjustable armband fits arms 8" to 16" and an Armband Extender is available for larger arm sizes (see EX3 sold separately)