The Worthy Dog Apex Jacket/Thundershirt Size 26 The Worthy Dog Apex Jacket is an all-weather, three-season jacket, featuring a water-resistant bonded outer shell with reflective trim and a warm fleece lining. Fully adjustable with touch fastener closures around the chest and belly, it's quick and easy to take on and off. The sewn-in harness hole at center back. Please see sizing chart in photos Minor imperfections as shown, overall good condition.