Quick Answer
A wool blanket can provide some insulation, but it may not be as effective as a dedicated sleeping bag, especially in extreme cold or wet conditions. This is due to differences in design, materials, and construction. In general, a wool blanket will not match the performance of a sleeping bag.
Insulation Comparison
When comparing a wool blanket to a sleeping bag, consider the R-value, which measures insulation performance. A good sleeping bag typically has an R-value of 2-5, while a wool blanket may have an R-value of 1-2. This means the sleeping bag will provide better thermal insulation.
Durability and Versatility
Wool blankets are often more durable and versatile than sleeping bags, with fewer seams and no need for a synthetic or down filling. However, this also means that a wool blanket may not be as compact or lightweight. For example, a 2-liter wool blanket might weigh 3-4 pounds, while a 2-season sleeping bag might weigh 2-3 pounds.
Wet Performance
In wet conditions, a wool blanket may not perform as well as a synthetic or down-filled sleeping bag. Wool retains some insulating properties when wet, but it loses up to 50% of its insulating ability compared to dry wool. In contrast, synthetic and down-filled sleeping bags can maintain up to 80% of their insulating ability when wet. Consider using a wool blanket in dry conditions and a sleeping bag in wet or extreme conditions.
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