Final answer:
Synthetic rubber is sometimes used for the soles of nonslip footwear because of its non-adhesive properties, low coefficient of friction, and resistance to water.
Step-by-step explanation:
The material sometimes used for the soles of nonslip footwear is synthetic rubber. Synthetic rubber, such as polybutadiene, polychloroprene, and styrene-butadiene rubber (SBR), is commonly used for shoe soles to provide traction and prevent slipping. These materials have non-adhesive properties, low coefficient of friction, and good resistance to water, making them suitable for nonslip footwear.