Don’t sweat, this will be your favorite shirt to adventure in no matter the time of year. Minus 33® Men's Chocorua is their #1 selling top provides warmth, breathability, and ultimate comfort for any occasion. Wear it as part of a layering system in colder temperatures or by itself when the sun comes out. Midweight Merino Wool Interlock Knit fabric UPF 50+ sun protection Moisture-wicking Anti-microbial odor-resistant Crew neckline Tagless label Flat lock seams prevent chafing Fit Tip: Regular - Standard Fit with a little bit of room to breathe, but not too baggy - runs true to size Ideal Seasons: Spring, Fall, Winter Activities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports Temperature Recommendations: 30°F to 0°F while active, 30°F to 60°F while inactive Recommended care: turn inside out; machine wash cold, gentle cycle with like colors, mild or wool-specific detergent; tumble dry on low heat; store in an airtight container when not in use for long periods of time; do NOT use fabric softener or bleach Product Features: Fabric:100% Australian Merino Wool, 235 g/m2 Interlock Knit, 18.5 Micron Fibers Weight:Size Large = 9.6 oz. (272 g) Minus 33 Men's Chocorua Midweight Merino Wool Crew-Neck Base Layer Top