form-fitting cover
nounUK /ˈfɔːmˌfɪtɪŋ ˈkʌvə/
US /ˈfɔːrmˌfɪtɪŋ ˈkʌvər/
A cover that fits tightly and closely around the thing it covers.
She put a form-fitting cover on her phone to keep it safe.
OTHER MEANINGS
2. A protective sleeve that hugs the shape of a device.
The tablet's form-fitting cover has a soft lining inside.
3. A stretchy fabric cover that clings to furniture.
They bought a form-fitting cover for the sofa so it looked neat.
4. A thin outer layer that follows the outline of an object.
The car seat came with a form-fitting cover in black.