stretchy

People who have had hysterectomies, and people with conditions like obesity or Ehlers-Danlos syndrome, which affects collagen and makes tissues stretchier, are at a higher risk.

Gels -- such as contact lenses -- contain liquid and are soft and stretchy.

"A lot of yarn isn't very stretchy, yet once knit into a fabric, the fabric exhibits emergent elastic behavior," Singal said.

The soft and stretchy patch can be comfortably worn on the temple to provide three-dimensional data on cerebral blood flow -- a first in wearable technology.

Elastomers are synthetic polymers that can be manufactured with a range of mechanical properties, from stiff to stretchy, making them a popular material for such applications.