Keep your neck warm. On a cool day, pull the neck warmer from Tufte over your chin and mouth or turn it into a beanie. A good neck warmer has many uses, but most importantly - it must be comfortable. This one is made of Bambull® - Tufte's wonderful two-layer fabric with bamboo viscose on the inside and warm merino wool on the outside. The neck warmer is super soft and perfect for those with sensitive skin. This garment is your best friend when hiking, or anytime when you are out and it's a little chilly.