Purchased in February 2021. I have used it carefully, so I think it is still fully usable. It is very lightweight and has aerodynamic effects, and is MET's flagship model. The following is a product description. MET's Trenta 3K Carbon helmet, a design that combines comfort and safety. - Brand: MET - Model name: Trenta 3K Carbon - Size: M (56/58 cm) A MET bag is also included. "TRENTA," the flagship model of the Italian helmet brand MET, is also used by the UAE Team Emirates. It is an all-around helmet that combines excellent aerodynamics, derived from a streamlined shell shape through wind tunnel experiments, and high breathability due to effectively placed ventilation holes. It takes in air from 19 openings and exhausts hot air from the rear through internal channels, providing a cool wearing experience even in summer. The "NACA VENT" hole on the top of the head is designed to utilize the Venturi effect, and is designed to take in air vigorously by making the entrance smaller. In addition, the exhaust port at the rear is equipped with a deflector at a 25-degree angle, which actively promotes exhaust even when the head is facing down, maintaining high breathability even in an aggressive position. The top-grade "TRENTA 3K CARBON" uses carbon as the shell's skeleton to enhance lightness and shock absorption.