<https://fitandbendy.com/2015/03/20/ode-humble-back-warmer/#webpage>
<http://schema.org/description>
"Backwarmers don’t create heat, they are just simple tubes of warm, cozy material that keep your body heat in and your muscles warm. They are used by contortionists the world over in training and warm ups."
<https://fitandbendy.com/2015/03/20/ode-humble-back-warmer/>