Waterproof jackets are often an outer layer you can add when needed. Make sure you have enough room to move around and be active in your rain jacket, even with a thicker and warmer layer underneath. Also look for waterproof materials that breathe as well as added ventilation zippers under the armpits so you can regulate your body temperature and be dry and comfortable even during high-intensity activities. A spacious hood is also good to quickly protect your head if you are surprised by a rain shower. If you are going to use your rain jacket for every day or less strenuous activities without staying out in the rain for hours, a water resistant jacket might work just as well. Are you buying a waterproof jacket but are not sure of the size? Look at our size guide.