Shinmax Bicycle Helmet With Detachable Visor And Rear Light Is A Lightweight, ???? IMPACT RESISTANT : Shinmax bike helmet is CPSC CPC Approved (American National Standard) and CE Marked (European Standard),bike helmet is carefully constructed with an all-in-one polycarbonate solid PC shell and high-density shock-absorbing EPS foam, giving it excellent shock absorption and drop resistance, effectively reducing impact forces and providing you the most reliable safety. ???? LED REAR LIGHT : This bicycle helmet comes with LED rear back light includes 3 different lighting modes - steady, slow flashing and fast flashing which can remind other riders or cars behind you to recognize your direction clearly,makes your cycling more safer and brighter at night or in the darkness weather.(An extra replacement battery included as a bonus). ???? DETACHABLE SUN VISOR : Adult bike helmet designed with a detachable sun visor which can be easily and securely removed to keep the sun out of your eyes and prevent rain from getting into your eyes while riding.The wrap-around padding increase comfort and is easy to clean as it is removable, strengthening the internal structure and ensuring your head is fully wrapped in a secure and breathable condition. ???? ADJUSTABLE DIAL SYSTEM : Mountain bike helmet can accommodate heads of all sizes with size adjustable system,an adjusting knob at the back of the adult helmet can increase or decrease the size of the helmet from 22.44 to 24.41inch(57- 62cm),with a custom fit and fit for most teens and adults. ???? SUPERIOR VENTILATION and LIGHTWEIGHT : With 22 breathable vents design make the air go through the helmet,increase the speed and keep the head cool during riding,suitable for riding, skiing,scooter and other outdoor activities,weight about 270g will not cause any burden to your head during cycling.