DESIGN & DETAILS: COMFORT LEVEL: This sleeping bag is just right for cozying up in temperatures between 20degF and 40deg HEAT RETENTION: This sleeping bag's hooded feature prevents heat from escaping, so you can sleep soundly and stay nice and warm all night long FRUSTRATION FREE: No more snagged zippers! The triple-needle stitching on the lining near the zipper means you can zip and unzip this sleeping bag with ease and without any frustrating snag LINER INTEGRATION: Customize your sleeping experience with the option to add a CORE liner SLEEPING PAD INTEGRATION: Say goodbye to slipping and sliding around in your sleeping bag - this one comes with built-in sleeping pad MACHINE WASHABLE: This sleeping bag's plush hollow core fiber fill is machine washable, making clean up easy peasy