The unexpected weather in the wild pushes the campers to find the best protection in fighting all of the condition. Waterproof sleeping bag shell is a solution to protect you from the rain. For basic or family oriented camping, shells made of polyester, nylon, or taffeta is your best option. They are waterproof, durable, and breathable. If you opt for better material, try the DryLoft. It is super waterproof yet less breathable. You may also choose the Ripstip material which is suitable to be used frequently and is able to prevent the water to infiltrate the insulation system. Ripstop is also highly breathable. Your choice!