160 gsm - Friends, we have an announcement: Duckworth has created the World's Best 100% Merino Wool baselayer material - Maverick. Let's repeat that: this Maverick Long Sleeve Crew is a 100% Merino Wool baselayer. Thanks to Duckworth's Montana-grown Merino Wool, the highest quality available and therefore boasting an incredible degree of "crimp," our elasticity is all natural. Plus, none of our competitors can actually claim this exceptional pairing: 100% Merino Wool, forged right here in the United States. And let's remember what Duckworth wool can do for you: moisture-wicking, incredibly soft, no-itch, odor-free, and super warm baselayer performance for any outdoor sporting discipline.