How Does Compression Affect Performance of Wool and Synthetic Insulation?

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Compression Limits Wool insulation typically compresses to about 1/3 of its original thickness without significant loss of insulating performance. However, excessive compression can damage the fibers and reduce performance. For example, compressing wool to 1 inch thick can make it less effective at temperatures below 40°F (4°C). Synthetic insulation, on the other hand, can compress to about 1/5 of its original thickness before losing significant insulating performance.
Material Variations Different types of wool insulation have varying levels of compression resistance. For example, merino wool is more compressible than Corriedale wool, but both materials can still maintain some insulating performance even when compressed. Synthetic insulation, such as Polarguard or PrimaLoft, also comes in different types with varying levels of compression resistance. Some synthetic insulations are designed to be more compressible and packable, while others prioritize maintaining insulating performance even when compressed.
Performance Considerations When choosing between wool and synthetic insulation, consider how you plan to use the gear. If you’ll be packing the insulation in a small space, wool may be a better option due to its ability to compress without losing too much performance. However, if you need the highest possible insulating performance in a given space, synthetic insulation may be a better choice despite its reduced compressibility.