The excellent SD-A019 In-mold Cycling MTB / Road Bike Safety Bicycle Adult Helmet with 21 Holes is highly recommended for each cyclist and outdoor activities enthusiast here. Made of high quality PVC shell and high-density black color printing EPS foam shell， it will provide best protection for your head during cycling and other sport activities. With adjustable rotary internal regulator design for a more flexible use and nice look， you can adjust the tightness of head circumference size flexibility according to your demand. Moreover， the specially designed21 smart vents make airflow quickly， help you to keep a cool head on the road. Good choice for you!                                    Features            New and high quality integrally molded helmetPVC shell and high-density black color printing EPS foam shellWith adjustable rotary internal regulator， adjusts the tightness of head circumference size flexibilityForm a unique and beautiful， diverse style of fashionLightweight and comfortable to wear21 front and rear wind vents make airflow quickly - High air permeability performanceProvide best protection for your head during cycling and other sport activitiesPast the impact test and pulling test                                                            Specifications            Material    Plastic And Foam    <br>Color    Red    <br>Hole    21    <br>Dimensions    10.62 x 8.66 x 5.51 " / 27 x 22 x 14 cm ( L x W x H )    <br>Weight    9.45 oz / 268 g     <br>                                                            Package Includes            1 x Bicycle Helmet<br>