You shouldnt have to choose whether you want your dog to be warm or be securely walked in his harness. Get your dog a sweater that can do both! The athletic K9 Core Sweater is designed to keep your dog warm without inhibiting their natural, adventurous flow. The two-way zipper gives you easy access to any harness or collar attachments. Wear it as a standalone fleece, or layer under your favorite Kurgo coat for extra warmth in the cold. With a zippered neck opening & soft hook and loop closure, its designed to accommodate dogs of all sizes.