The Best Men's Lightweight Insulated Jackets
These jackets include down, synthetic, and hybrid insulated pieces. The down models will be the lightest and most packable, and are the most desirable for those trying to go ultralight. Synthetic insulation is not as vulnerable to wetness, so it can handle snow, rain and sweat-soaking while retaining some degree of insulating ability. Synthetics are also typically wrapped in a tougher face fabric and can withstand frequent contact with rough rock, hence they’re more durable.
If you do tear a hole in the face fabric, synthetic insulation won’t leak out like it would in a fragile down jacket. Modern synthetic insulations such as Polartech Alpha and Arc’teryx’s proprietary Coreloft begin to compete with lightweight down jackets in terms of warmth, and are just slightly heavier and bulkier. Arguably, synthetic insulation is more versatile since it functions in a wider range of conditions and can handle rougher treatment.