The SH-TR501 (TR5) is a Short Course Triathlon Racing Shoe: Designed to quicken transitions and maximize your power so you go faster Optimized Power Transfer: Stiff and lightweight fibreglass reinforced sole efficiently transfers power Designed for Fast Transitions: One strap fastening, extra-wide opening, and large heel loop make it quick and easy to get shoes on and off Breathable and Quick To Dry: Breathable mesh and water-resistant upper with venting for great ventilation and quick drying Wear Without Socks: Soft liner makes it comfortable to wear without socks for faster transitions The TR5 is an ultra-stiff and lightweight triathlon shoe designed to quicken transitions and optimize your power transfer. It’s also well ventilated and dries quickly, and has a soft liner so that it’s comfortable to wear without socks. This shoe is all about speed.