Note: Please measure your dog"s head and tail carefully before you buy, and then refer to the size we provide to choose when to size. 1---[Ventilation and cooling design]: Our Streamlined dog motorcycle helmets with 14 air vents are designed for reducing wind Drag and increase airflow to keep your pet cool and breathable during summer riding. 2---[Pet-Friendly]: Our dog helmet provides high-density EPS foam interior which features lightweight, will not add any pressure on your lovely pets" head and effectively minimize the risk of head injuries in case of accidents. 3---[Comfortable&Easy-adjust]: Our bicycle helmet hat has quick release buckles with one touch control for easily putting on and off. And with soft detachable sponge mat inside, it will keep comfortable even if worn for a long time. 4---[Cool Look & Cool Fashion]: Our pet helmet is designed for dogs outdoor activities,especially for motorcycling ,biking, walking. When you put on your motorcycle helmet, please help your pets put on theirs. 5---[Size]: To properly measure your pooch,please measure the circumference of the dog"s head with a fabric tape measure and refer to the size information to make correct purchase. Material: ABS+Cotton+Polyester Colour: black, pink, purple, grey, white, red