The Doodlebone® Neo-Flex harness is made from neoprene - an incredibly strong yet soft and stretchy material no matter the weather . The clever design distributes the weight across the dog's chest instead of concentrating it on the neck. This is especially good if your dog likes to pull . This allows you to keep full control during the walks and give your dog a more comfortable walking experience than with a conventional collar. In addition, you can soak this fabulous Neo-Flex dog harness in cold water, giving your furry four-legged friend a chance to cool off on hot summer days. - Prevents dogs from pulling when walking - Prevents pressure on the dog's neck - Fully machine washable - Five sizes to fit most dogs (chest circumference): - XS: 30-41cm - S: 35-52cm - M: 43-63cm - L: 54-84cm - XL: 59-97cm