Simple, comfortable, quiet. Made from comfortable lightweight cotton, the Wasatch-CB Long Sleeve T-Shirt offers excellent camouflage concealment in hot to temperate weather. When it's time to get to messy, roll your sleeves up and get down to business. CB = Core and Basic. not every hunting excursion requires gear rated for torrential rain, raging blizzards, or mercury plummeting below freezing temperatures. Core and Basic gear are perfect temperate weather when you're focused more on being silent than being warm.