A SUITABLE SLEEPING BAG IS FIRST – 30℉: Comfort is 41℉, limit is 30℉, and the risk is 5℉. 20℉: Comfort is 32℉, limit is 20℉, and the risk is -11℉. Further, the regular fit can fit up to 5'11", and the long fit can fit up to 6'7". So, consider your own needs and the environment when choosing a sleeping bag.