They are generally made from sturdy leather uppers and non-leather outsoles. Casual shoes are characterized by sturdy leather uppers, non-leather outsoles, and wide profile. Uppers and insoles are made from European-sourced leathers, while most models use Vibram outsoles. Originally, all Havaianas featured white insoles with colored outsoles and straps. A worn piece of footwear will gradually acquire unique wear and tear on the outsoles. Some road shoe outsoles have additional holes which are claimed to assist in ventilation. When the outsoles wear out, they can be replaced with new ones. The CTR360 Maestri II is available in the same five outsoles as the original.