adidas Trefoil T-Shirt. The adidas Trefoil first appeared on the scene in 1972, and it continues to make its mark. This archive-inspired t-shirt celebrates the symbol's legacy. It's made of cotton jersey for a soft feel. Regular fit is not tight and not loose, the perfect in-between fit. Ribbed crewneck. Short sleeves. Soft feel. 100% cotton single jersey. Machine wash. Imported.