One of most wonderful fabrics for moisture-wicking, TENCEL Lyocell is well worth knowing about, if you don't already. It's what the Livingetc team ask for when they're shopping, knowing that it'll be both soft and cooling to sleep under. TENCEL is a textile that is created by environmentally friendly processes, and made using natural materials in their raw state.
The beauty of TENCEL is how soft it is, though. Not dissimilar to cotton, and just so breathtable - anyone who suffers from hot nights and waking up warm can help to counterbalance that by sleeping under TENCEL. It cools itself, and in turn cools you. A must for the summer months.