Description from the vendor website:

Dogs can hold their stride with the Vert™ Vest no matter what elements are thrown their way. Designed to embrace the wintry mix that would otherwise mean spending the day inside, the shell fabric is windproof and waterproof. The Vert™ Vest features extended waterproof coverage over the hips and thighs and recycled, lofted insulation that packs exceptional warmth. Leg loops keep the jacket in place when the winds kick up, and the leash portal allows the Vert™ to be worn over a harness.