Carhartt work pants are made from a variety of tough materials:
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Duck or 
Firm Duck is made from stiff, ring-spun cotton. Part of the canvas family, 
duck fabric is snag proof, wind proof, and extremely durable.
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Canvas is a lightweight, durable material made from 100% cotton. While slightly lighter than Carhartt duck, 
Carhartt canvas pants are both rugged and comfortable.
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Washed Duck is made from durable, classic duck that's been washed to give it a worn-in look and feel. 
Washed duck fabric breaks in faster, but maintains its durability. Washed duck is comparable to Carhartt's now-retired sandstone fabric. 
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Ripstop is a reinforced poly/cotton fabric that's designed to keep rips from spreading. 
Carhartt ripstop pants have a small grid-like pattern on their surface. 
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Twill is lightweight and durable. 
Twill fabric gives the appearance of dress slacks and is a popular choice for workers who wear uniforms.