Sleeveless shirts for men are 100% cotton twill.
Colors vary 

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Bright orange with black tie dye.  A bikers Cave Exclusive. Medium to 5x

Mens sleeveless shirt - Dk. Blue AL2906

Mens sleeveless shirt - Orange AL2902

Mens sleeveless shirt - White (cream) AL2903

Mens sleeveless shirt - Purple AL2908

Mens sleeveless shirt - Yellow AL2907

Mens sleeveless shirt - Black AL2901

Mens sleeveless shirt - Lt. Blue AL2904

Mens sleeveless shirt - Red AL2905