The Dalbello Aerro 57 is unique in its class with its high tech, bi-injected technology construction. Engineered for sport and recreational skiers seeking a traditional fit ski boot that is highly versatile and easy to use. The Aerro 57 provides the optimum balance of all day comfort with all terrain performance and control. The Aerro last is the most accommodating fit last provides immediate and enduring comfort. Extra bootshell volume fits wide feet comfortably and permits the use softer cushioning and insulating materials in the innerboot.