Thank you for viewing! Please read the profile before purchasing. This is a reversible, cold-weather vest!! It's warm because it's a combination vest of warm burgundy quilted fabric and fleece lining on the inside. It's warm! The fleece is fluffy and feels great! My dog wears it over his clothes when we go for walks ^^ It fastens with snap buttons. Neck: 32-44cm (If your dog's neck is 40-44cm, they won't be able to wear clothes underneath, it'll be, uh, tight...) Chest: 50-60cm Approximate back length: 30.5cm Approximate front length: 22.5cm Are there any French Bulldogs that fit these sizes? ❤︎ Please understand that this is handmade before purchasing.