Fully adjustable: Neck and waist adjustments for perfect fit and security Super BuckleTM: High quality POM buckle with 4 points lock system. Fully breathable: 3D mesh used inside and out to allow air to flow through the harness Dry-fast technology: Lightweight breathable mesh dries up quicklyToy/Extra Small Size :  Neck: 19 - 24 cm (7.5 - 9.4 in), Girth: 33 - 41 cm (13 - 16.1 in). Recommended Breed Types: Chihuahua, Yorkshire, Greyhound, Pomeranian, German Spitz, etc. Small Size :  Neck: 27 - 32 cm (10.6 - 12.6 in), Girth: 41 - 51 cm (16.2 - 20 in). Recommended Breed Types: Poodle, Shih Tzu, Bichon Frise, Boston Terrier, Maltese, Japanese Spitz, etc. Medium Size :  Neck: 35.1 - 40 cm (13.8 - 15.7 in), Girth: 52.1 - 62 cm (20.5 - 24.4 in). Recommended Breed Types: Beagle, Pug, Dobermann, Shiba Inu, Corgi, Basset Hound, French Bulldog, etc. Large Size :  Neck: 43.2 - 48 cm  (17 - 18.9 in), Girth: 63 - 82 cm (24.8 - 32.3 in). Recommended Breed Types: Golden Retriever, Dalmatian, German Shepherd, Labrador Retriever, Chow Chow, English Bulldog, Siberian Husky, etc.