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Rollerblades, also known as inline skates, are a type of wheeled sports equipment designed to be worn on the feet. They consist of a boot with wheels attached in a single line, similar to ice skates. Rollerblades were first created in the 1980s and gained popularity as a recreational and fitness activity in the 1990s. They are commonly used for various forms of skating, such as freestyle, speed skating, and aggressive skating. The wheels of rollerblades are typically made of polyurethane and come in different sizes and hardness levels for different types of skating. Despite being similar to traditional roller skates, rollerblades provide a smoother and more efficient skating experience.