Wholesale graphene far infrared heated therapy deep sleep pillow for cervical muscle tension relief

1. Release 6-14 μm short-wave infrared rays, generate the same frequency resonance with the human body, replenish energy and improve blood circulation.
2. The concentration of negative oxygen ions is 1000-1500/cm³. Promotes deep sleep.
3. Relieve mental fatigue & enhance sleep quality. 
4. Relieve cervical muscle tension.
5. Bionic gel+ergonomic design, fit head and neck curves, maintains natural cervical curvature.