Sriracha Men's Hot Chili Sauce T-Shirt Solid colors (Black, Red, etc.) are 100% Cotton. Heather colors (Heather Red, etc.) are 65% Polyester, 35% Cotton, a Soft Cotton/Polyester blend, medium weight, soft and durable. Machine Wash Crew neck Short sleeves Front graphic A Sriracha screenprint spices up this tee from your favorite red chili sauce company.