Why Zip Up Fleece Vest? For some dogs, it is nearly impossible to put on a pullover vest. Maybe your pooch is overly excited, or maybe it is just sensitive or fearful of having something put over its head. Whatever the case may be, it is ok. The step-in style apparel solves all that. Our Zip Up Fleece Vest is a step-in version of our popular Fleece Vest. It's super simple to put on. All it takes to put it on is having your furry friend step-in. And you zip-up. And done. It can be worn for all-day comfort and warmth and it also comes with two leash attachments for extra convenience so you don't need to put on an extra harness.