A structured knit with enough weight to hold the color-block panels crisp at the seams rather than a soft, drapey jersey. Machine wash cold with like colors — the contrast panels are sewn, not printed, so there's no risk of the color transferring, but wash separately the first few times as a precaution. After the first few washes, the structured knit and sewn panels hold their crisp seam lines with normal care, so ongoing care is no different from a standard cotton tee.