The classic thermal Henley, but updated to fit better on taller people. Baby thermal (55% cotton / 45% polyester) constructio... The classic thermal Henley, but updated to fit better on taller people. Baby thermal (55% cotton / 45% polyester) construction. Long sleeves.Baby rib thermal (55% cotton / 45% polyester) collar and cuffs. 4-button Henley placket. Flatlock shoulder, side, sleeve seams. Durable double-stitched collar and placket. Fluorescent colors - machine wash separately. For optimal screenprinting results, cure at 350ºF (180ºC) for 12 seconds.