Storm Jacket Camera Covers are the most compact and portable camera protection you can carry with you everywhere you go. so you won't hesitate to use it anytime the camera is going to get wet, dirty, or sit in the sun. They are perfect for live shots setups, locker room celebrations, shooting in rain, drizzle, snow, and dusty or dirty environments. They aren't meant to replace heavy-duty covers and rain slickers costing hundreds of dollars when you really need that level of protection. Storm Jackets can be slipped on and off in less than 5 seconds, which means you'll actually use them when you'd otherwise just let the camera get wet because you didn't want to struggle with a bulky cover. When you're done with it, just shake it off, stuff it back into it's zippered case, and shove it in a pocket. The cover and case together only weigh about 2-5 ounces depending on the model. Built from high-tech AquaNylon fabric, Storm Jackets will never lose their water repellency and are rugged enough to withstand the rigors of professional use. Storm Jacket Camera Covers come in several sizes, colors, and models to suit nearly every professional camera. There are three SLR Models to fit all digital/film cameras with different lenses. The Small size fits any SLR with most lenses up to about a 80-200mm f/2.8. Here's how to tell if it will fit your camera: Measure your camera/lens from therear of the body to the front of the lens. If it's 9 or less, this is the cover for you. The Medium size (recommended for most customers) works well for short lenses up through 300-400mm f/2.8. Measure your camera/lens from the rear of the body to the front of the lens. If it's 7 -15, this is the cover for you. The Large size is built for very long lenses. Measure your camera/lens from the rear of the body to the front of the lens. If it's 14 -23, this is the cover for you. but, you might want to get a smaller size to go with it.