What property of elastin contributes to the skin's resilience?

The property of elastin that contributes to the skin's resilience is its elasticity. Elastin is a crucial protein within the connective tissue that allows skin and other tissues to stretch and then return to their original shape. This elasticity is vital for maintaining the structural integrity and flexibility of the skin, enabling it to withstand various stresses such as deformation from movement, compression, or pressure without tearing or losing its shape.

In contrast, rigidity would limit the skin's ability to move and adapt, density does not directly relate to resilience but rather to volume or thickness, and brittleness implies fragility, which contradicts the function of providing resilience. Therefore, the elasticity of elastin is the key factor that enables skin to remain resilient over time.