Hurtta Polar Visibility Dog Vest NO TWO DOGS ARE THE SAME - Dont guess on the size. Use the size chart along with the Measuring Your Dog size guide. The chest measurement is the most important for the Polar Vest USES - The vest is ideal for sporting activities, hunting and daily walks where visibility and being able to identify your dog is a must HI-VISIBILITY  In addition to the hi-visibility colors the Polar Vest has huge 3M reflectors on each side for night time safety FREEDOM OF MOVEMENT - The Polar Vest yields to the dogs movement as to not restrict them from activities WATER RESISTANT - The vest is made from rustle-free Softshell fabric with a laminated water-resistant Houndtex layer