A band of elastic material.
Elastically.
Spontaneously returning to its original shape; springy; accommodating; buoyant.
Salome's step was light and elastic as she walked away towards Edinburgh Crescent. – Salome by Emma Marshall
The Broad Churchman here is still a Churchman, but the system is much more elastic and much more intellectual. – Recollections and Impressions 1822-1890 by Octavius Brooks Frothingham