Get used to it quickly: Designed according to dogs head feature, there are 2 ear holes in the dog helmet, will stay well on dog's head. Sponge is also added inside this bike helmet, will make your dog loves this comfortable and safety helmet soon. Ultra hard material for safety: This dog hat helmet made of lightweight but sturdy ABS material and soft sponge, all give your dogs head the best protection when dog hit or bitten by other animals. Stay on head well: The ear holes and adjustable strap increased stability of the helmet, will not fall off in normal daily use. Suitable for: Any situation where a dog needs protection, such as driving, motorcycling, biking, walking. Also a good choice for daily dress. Material: PC + polyester + frame cotton, Product size: S size: head circumference 37cm, top diameter (middle distance between two ears) 7.5cm, adjustable length (including chin) 42-47cm M size: head circumference 42cm, top diameter (distance between two ears) 7.5cm, adjustable length (including chin) 47-57cm L size: head circumference 50cm, top diameter (distance between two ears) 8.3cm, adjustable length (including chin) 57-64cm; There are 2 ear holes on the dog helmet, which is convenient for the dog's ears to leak out and not compress the ears.