The Mac In A Sac rain jacket from Mac in a Sac is a lightweight, unlined shell made to keep you dry when you’re out in wet weather. It’s designed for everyday outdoor use, whether you’re hiking, cycling or just out running errands under grey skies.
With a 10,000 mm water column membrane, this jacket sheds steady rain before it soaks through, while the 8,000 gsm breathability rating helps sweat vapor escape as you move, cutting down on that clammy feeling inside. The simple unlined design keeps bulk and weight to a minimum, making it easy to layer over a fleece or roll up and stash when the sun breaks through.
The water column rating indicates how much water pressure the fabric can withstand before leaking—at 10,000 mm it stands up to moderate to heavy rain. The breathability figure of 8,000 gsm refers to the grams of moisture vapor that pass through a square meter of fabric in 24 hours, so you stay drier from both external showers and your own perspiration.