Rich Australian wool blend - 19.5 micron, 360gsm The ideal outer layer, our Fleece Merino Vest is perfect for keeping little ones warm while allowing more freedom for arm movement. The durable YKK zip will stand the test of time, and the internal zip cover and housing means the zip won’t ever rub against the skin. Finished with a buttery soft stretch rib to keep the sweatshirt secure, and the cold out.