Bandanas are 100 % cotton. They have been pre-washed. Most bandanas are 21 inches by 21 inches which generally fit medium and large sized dogs. They can be made smaller if you supply the approximate weight of your dog. If you supply the dog’s name it will be applied to the bandana with heat activated vinyl. You may choose the color for the vinyl lettering. Finished product is machine washable, best on cold to avoid material bleeding on the letters.