Our very first Christmas Jumper is made from 80% Ringspun Cotton and 20% Polyester. For chest measurement, place the tape across your chest from underarm to underarm and measure the front only - do not measure the whole way around! Length measurement is from your collar to the bottom hem. Sleeve measurement is from the centre of your back to the sleeve hem. Top tip: Compare our measurements to a jumper you already own by placing it on a flat surface and use the tape measure! Machine wash according to instructions on care label.