ROCKBROS Bike Helmet Adult Bicycle Helmet for Men Women Lightweight Comfortable Cycling Helmets Adjustable Helmets for Youth Bike Accessories

[COMFORTABLE ＆BREATHABLE: Our helmet for adults is designed with 18 breathable vents to channel air back and forth which can effectively reduce air resistance. Also the bicycle helmet can ensure ventilation and breathable when riding bringing comfort to you. STREAMLINE ONE-PIECE DESIGN: This adult bike helmet appearance with streamline design one-piece molding can effectively break the wind. PC shell one piece wrap edge more simple and beautiful which is comfortable to wear. IMPACT RESISTANCE: The bike helmet for men women is made of high-density PC shell and EPS foam. The durable shell can effectively protect your head and the soft lining can play a shock-absorbing and cushioning role both can improve the safety of cycling. LIGHTWEIGHT HELMET: Our bike accessories for adult bikes is light weight only about0.55lb（250g） making it lighter and stress-free to wear. In addition this helmet is available in a variety of colors to meet your needs. ADJUSTABLE SIZE: This mountain bike helmet is available in two sizes and can be freely adjusted according to the size of the head circumference. Our bike helmet can 360° rotation adjustment you can easily complete the adjustment with one hand. Size M: 21.65-22.83 inches (55-58cm) Size L: 22.83-24.02 inches (58-61cm).]