M11178 Marmot Men's Echo Featherless Jacket Looking for warmth without the weight? Pull on the Men's Echo Featherless Jacket from Marmot. Made from recycled nylon fishnet and 3M Thinsulate Featherless insulation, this jacket lets you enjoy the feel and performance of natural down without any allergens. Plus, it keeps insulating when wet, whether from perspiration or an errant spill while gathered 'round the campfire.