Sizes: Offered in a small which is 26cm in circumference and 9cm in diameter, a medium which is 32cm in circumference and 11cm in diameter or a large which is 40cm in circumference and 14cm in diameter. Options: Choose between a helmet only or a helmet and goggles set for your pet. Purpose: Keep your pet safe as they travel as a passenger on your bike or motorcycle with this protective helmet set, perfect for both dogs and cats. Colour: Black. Pet Helmet: Get a pet safety helmet. Material: Made to be durable and last for many uses, this set is crafted from ABS & Plastic. Pets Safety Helmet Set | Living Social | Living Social