Can Mylar Bivys Be Used for Winter Camping?

Choosing a Suitable Mylar Bivy

When selecting a Mylar Bivy for winter camping, look for a model with a waterproof and breathable membrane, such as a 5,000 mm or higher hydrostatic head rating. The bivy should also have a built-in bug net and a durable, water-resistant fabric for the walls and floor. A good option is the Mylar Bivy with a 7.9 oz per sq yard PU-coated fabric and a 5,000 mm hydrostatic head rating.

Setting Up the Bivy for Winter

To set up the Mylar Bivy for winter camping, start by digging a shallow trench for the bivy’s floor. Add a layer of insulating material, such as a 2-3 inch thick foam pad or a 3-season sleeping pad, to the bottom of the trench. This will help to keep the cold ground from transferring heat away from the bivy. Next, place a tarp or plastic sheet above the bivy to create a windbreak and weather shield. Finally, use a warm sleeping bag rated to at least -20°C (-4°F) and layering of insulating clothing to stay warm inside the bivy.

Insulating and Ventilating the Bivy

To keep the interior of the Mylar Bivy warm and dry, it’s essential to insulate and ventilate the space effectively. Use a warm hat, gloves, and a face mask to prevent heat loss, and consider adding a hand warmer or chemical heat pack to the bivy for extra warmth. To prevent moisture buildup, use a breathable membrane, such as a piece of Gore-Tex or a similar material, to line the inside of the bivy. This will help to transfer moisture from the inside of the bivy to the outside, where it can evaporate.