Made of instant cooling fiber fabric with good breathability.Size is flexible and easy to put on your dog.Cute pattern design especially improves your cooling view.If you put it in water, wring it out, then put it in the refrigerator for 10 minutes and take it out again, the cooling effect will be more obvious. (M) body length 29cm chest 42-48cm neck 37cm recommended weight 11-20 kg reference species: Teddy small body Fatou