The second piece of the layering system is the mid-layer. The mid-layer provides insulation – keeping you warm by trapping body heat. Fleeces, down jackets, or synthetic insulated jackets all fall under the mid-layer category.
For outdoor adventures in colder conditions, opt for a down or synthetic puffer jacket, which provides the best warmth-to-weight ratio. However, synthetic options are more versatile in wet conditions since down loses its insulating properties when wet
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