100% cotton. Crew neck. Regular fit You’ve heard of Armor Lux Callac T-Shirt, right? Well, here’s the more seasonally appropriate Long Sleeve Callac T-Shirt, still the soft and substantial cotton number we’ve grown accustomed to but now with the added benefit of full-sleeves. That crew-neck collar is a touch chunkier than most, and theres a little anchor near the hem too. Pledge allegiance to the high seas today!