Although there is much cutting and he thought whether to have been tactile feeling to which the shape of a straw was uneven， it was impressed by a soft feeling of a fit which sticks fast. Since the depth of its cervical vertebrae is not recognized， if it is a set of a green tea combination pillow suitable for 2.5~4 cm， and the charcoal combination pillow of a bamboo suitable for 3.5~5cmM， either should fit. Since I was not using the pillow until now， the lower green tea combination pillow suited me. Since there was heat dissipation nature， also while sleeping， it could sleep soundly by keeping one's head cool and one's feet warm!