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People who live in the coast feel warming in winter and cool in summer. It is because that seawater absorb heat from air in summer and release it in winter. We call this sea mode. Sea-Mode Sack is a brand new sleeping bag. It is made a new material of high enough specific heat whos melting point is 34 centigrade. When you are in a quite high altitude of mountain, the temperature varies from high to quite low. In daytime, the Sleeping sack can absorb heat from nearby. Been used at night it will release the heat stored in daytime. So it will keep forever comfortable 34 centigrade all the night. And it is low-carbon.