Helmet size chart: S: head circumference 26cm, diameter 9cm, height 5cm, adjustable strap 17-22cm; M: head circumference 32cm, diameter 11cm, height 6cm, adjustable strap 20-26cm; L: head circumference 40cm, diameter 14cm, height 7cm, adjustable strap 25-37cm; Cool look for small dogs – a helmet and goggles set designed for puppies. Easily style your pet with a unique and trendy appearance. Suitable for small dogs or cats such as Teddy, Pomeranian, Bichon, Chihuahua, Yorkshire Terrier, Pug, Corgi, Maltese, and similar breeds. Good protection – the dog motorcycle helmet is made of high-quality ABS material, sturdy and durable, helping to protect your dog's head. The hard lenses on the dog sunglasses are also durable and help reduce UV exposure to your dog's eyes. Adjustable strap – both the goggles and helmet feature adjustable straps, allowing you to customize the fit based on your pet's size. Ideal for various outdoor activities such as hiking, traveling, picnics, outings, amusement parks, photography sessions, costume parties, and other special occasions.