Assertion: actual flipper | /r/MadeOf | stiffer material
Facets:
Source sentences:
text: Swimming flippers made of two different materials are known, and particularly those with a soft rubber shoe while the actual flipper is made of a stiffer material.
text: Swimming flippers made of two different materials are known, and particularly those with a soft rubber shoe while the actual flipper is made of a stiffer material.