3D Nano Shell™
Technical Features

3D Nano Shell™

3D Nanoshell™ is a technology unique to Sea to Summit sleeping bags, designed to protect the RDS® certified ULTRA-DRY Down™ from internal and external moisture. A thin layer of a non-woven, siliconized polyester positioned directly inside the shell material allows moisture from the sleeper to pass outwards unhindered. If the vapor condenses against the inside of the cold shell material, the moisture cannot pass back through the hydrophobic siliconized polyester. This keeps the down dry and allows it to maintain its loft – especially valuable for multi-day expeditions with inclement weather.

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