PLS CHECK THE REFERENCE SIZE CAREFULLY AND CHOOSE CORRECT SIZE FOR YOUR PET.Material:Superfine fiber cloth+oxford cloth+PP cotton fillerWith a washable and detachable cushion at the bottom，no need of electricity to keep warmS size : Suitable for pet within 4kgM size: Suitable for 4- 9kg petMaterial: 100% CottonWash Style: Hand WashFeature: BreathableWeight: S about 0.45kg ， M about 0.65kgPattern: Animal