IMPACT RESISTANCE: This bike helmet is specially designed for adult rider. Material of thickened multi-density EPS foam inside helmet absorb impact energy effectively to minimize the risk of harms to head in crash, and extended rear shaped ensures full protection to cranial part of head. LIGHTWEIGHT&VENTILATION: This biking helmet made of lightweight material, the inner pad use of breathable material to wear comfortably.The adoption of customized aerodynamic and ventilation design allow air go through the biking helmet which help increase the speed and keep stay cool. CAN ADJUSTABLE TO DIFFERENT HEAD SIZE: Ddial retention system is easy to adjust and secure the cycling helmet perfect fit on your head, It is very important for you to get helmet on head properly because potential dangers occurs easily with small or big size helmet. please measure your head circumference correctly before purchase, This helmet fits head circumferences 21.26-24.8in. BUILT-IN DETACHABLE VISOR: Sun visor on bicycle helmet is essential to all-mountain biking lovers, This reinforced sun visor is designed perfectly to match this biking helmet for you.Visor is easy to move upward and secure to offer you broad sights to keep safe, Vents on Visor ensure airflow pass to keep you cool. Large visor with insert-net can better keep discomforts from sun, leafs, other elements away to make you 100% attention on cycling. PERFECT SIZE: This adult cycling helmet goes with a standard size, The equipped with the easy-use dial system and side straps make this nutcase helmet adjustable to different head size and suitable for both men and women. IMPACT RESISTANCE: This nutcase bike helmet is specially designed for adult rider. Material use the tough and durable PVC & PC, EPS foam which help absorb the impact and protect the head during crash. VENTILATION: The adoption of customized aerodynamic and ventilation design allow air go through the biking helmet which help increase the speed and keep stay cool. LIGHTWEIGHT: This biking helmet made of lightweight material, the inner pad use of breathable material to wear comfortably. PACKAGE INCLUDED: 1 x Helmet, 1 x Visor (Can be detached from the helmet). Description: Lightweight integrally-molded EPS bicycle helmet. 18 vents bring cool air in and flush warm air out, well-ventilated. Soft removable, washable, antibacterial pads for best wearing comfort. Rotary internal regulator adjusts the tightness of helmet. Specifications: Color:AS the picture shows. Material: Durable PVC & PC, EPS Vent qty: 18 vents.