Marmot Boy's Mantra Jacket, Deep Forest/Bright Grass, X-Large by Marmot. $144.01. Sturdy protection that’s lightweight, waterproof and breathable, the Mantra opens up new vistas of pure fun. Marmot’s advanced MemBrain fabric technology handles nasty weather; powder skirt and brushed tricot lining on collar and shoulders add protection. Zippered handwarmer plus chest and internal pockets keep valuables safe.