This is a light weight hat designed to fully cover the ears. It fits anywhere from a medium to large. The green, olive and tan edge and top are cotton.  The beige is colorganic cotton - meaning it grows that color naturally. The dark ochre is linen, and the lighter color off white sections are undyed hemp.  There is also some cotton, linen, hemp & bamboo blend that is variegated beige, off white and tan with flecks of blue and white.