Snugpak Bivvi Bag WGTE Color:Black This means that they won’t

This means that they won’t suffer from internal fogging if you take them from one extreme of temperature to another

Insulation: 133g/135g PrimaLoft Gold® with a soft-touch matrix inner lining

X-Small 32-35" 27

and is regarded as one of the best options for use in baselayers

5cm DofE Yes

Snugpak Bivvi Bag WGTE Color:Black This means that they won’tWith a small volume and exceptional lightweight properties, the Bivvi bag WGTE can be used as the bare minimum for wild camping in the summer or used in conjunction with a sleeping system and air mat for planned camps all year round. A 5000mm Hydrostatic Head for waterproof and windproof durability, creating an enclosed micro climate that increases humidity and maintaining body temperature through the protection of evaporative and convection heat