An attachment mechanism that can be used to attach a portable or wearable electronic device to a user. The attachment mechanism may include a band strap having multiple links that are configured to wrap around a user's wrist. The links of the band may be spring biased and allow the band to be secured to a wrist or other object as it transitions from an open to a closed position. The amount of spring bias may be adjusted or specially configured to attach the device comfortably yet securely.