The tearing noise made by unfastening Velcro makes it inappropriate for some applications.
From the en.wikipedia.org
None of the 18 hockey helmets Mihalik studied fit properly, while seven could be removed without unfastening a single strap.
From the sacbee.com
In the midsection of the United States sits Nebraska, a state that boasts treasures worthy of unfastening your seatbelts and putting your tray-table in its upright position.
From the orlandosentinel.com
The practice is increasingly viewed as corrupt and a drag on unfastening the ties between private sector and state which prevent economic and political reforms.
From the en.wikipedia.org
More examples
Cause to become undone; "unfasten your belt"
(unfastened) not closed or secured; "the car door was unfastened"; "unfastened seatbelts"
(unfastened) open: affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"
(unfastened) unbuttoned: not buttoned; "the wind picked up the hem of her unbuttoned coat"
(unfastening) untying: loosening the ties that fasten something; "the tying of bow ties is an art; the untying is easy"
To loose; to unfix; to unbind; to untie; figuratively, to detach from any connecting link or agency; to disconnect; To come untied or unloosed