Flexibility or pliability is a property of matter or an object that indicates its ability to deform. A flexible object allows deformation more easily than a less flexible one. Stiffness is the opposite of flexibility.

Various substances are flexible. The degree of flexibility depends on temperature. Flexible materials can be made of natural rubber, plastic, or a mixture of these. Such materials are used for a wide variety of applications, including:

• seals in the form of rings and tire material
• inner tubes and tires for all kinds of vehicles
• sports equipment: balls, mats, shuttlecocks, etc.
• all kinds of footwear
• hoses for various industries, from garden hoses to hoses in the chemical industry