Throughout the 1890’s the legendary John Beargrease battled ferocious winter conditions running mail by dog sled between Two Harbors and Grand Marais, MN. We pay tribute to that un-bound spirit with our warmest base Layers. The 4.8-oz. 90% polyester/10% spandex fleece has knit-in channels that capture body heat while reducing bulk. Better yet, the hearty fabric has an anti-microbial treatment, breathability and fast wicking action that whisks moisture away from skin, so you'll never feel soggy or clammy when working up a good head of steam. Plus it's built for comfort on the move with side panels instead of chafing seams, and thumbhole cuffs for no-bunch layering. The warmth the bear any weather!