NWT Hill House Charlotte Sleep Tee Ski Chalet The Charlotte Sleep Tee is made of our soft, breathable, organic cotton interlock fabric - the same fabric we use in our baby products so you too can sleep like a baby. 100% Organic Cotton Made in Portugal About the Pattern Based off a hand-painted gouache print from the 1900s, Sherwood Forest is filled with all manner of woodland flora and fauna in updated, modern color palettes.