Full Face Dot Certified Dual Sport Helmet+ Bluetooth Rechargeable Headset DOT CERTIFIED HELMET : GDM Beast®Meets or exceeds DOT FMVSS- 218 motorcycle helmet safety standardsDrop Down Secondary Visor Aerodynamic shell design constructed using advanced lightweight composite poly-alloyRemovable and washable liner and cheek padsComes with a cloth carrying bag Matte Black Bluetooth Headset : GDM SuperSonic ®Rechargeable with micro USB port (included)Premium HiFi stereo speakers for clear sound quality Adopted Bluetooth 5.0 and Qualcomm aptX HD technology provide you super clear voice for talking. Fast and easy to pair any phone and answer callsSupports 12hrs continuous talking and 120hrs standby time in 1.5 hours single chargeHand free calling & listen to GPS directions or MusicWeather proof To choose your correct size, please measure the circumference of your head 1" above your eyebrows around your head and refer to the following size guide. Please note that the size chart is for reference only and cannot guarantee a perfect fit. Please use this chart as a guide only. 
GDM™ HELMETS (Duke Series) SIZE CHARTSmall 21 5/8" -- 22"Medium 22 1/2" -- 22 7/8"Large 23 1/4" -- 23 5/8"X-Large 24" -- 24 3/8" 2X-Large 24 3/4" -- 25 1/4" Normal 0 false false false EN-US X-NONE X-NONE SAFETY WARNING: Riding a motorcycle is a dangerous activity. No helmet can protect a wearer against all possible impacts. When riding, always wear a helmet, eye protection, protective clothing, gloves and boots. There is no assurance that serious injury or death can be avoided even if you wear the helmet shown in this listing. Take all precautions to avoid every risk when riding a motorcycle. This helmet is not meant for use as a fire retardant product and does not contain any fire retardant materials. Please ensure that your GDM® products fit properly. Improperly fitting products can impair your ability to control your motorcycle.