Mesh Material GEL INFUSED CHAIR CUSHIONS: Our office chair cushions for back and butt feature innovative gel infused memory foam. The lumbar support pillow and seat cushion provide full body support for your 8+ hour workday VENTILATED CHAIR CUSHION: Strategic ventilation holes in the memory foam of each gel seat cushion allows air to circulate throughout, never trapping heat so you always sit comfortable and cool BACK CUSHION FOR OFFICE CHAIR: Thanks to the ergonomic chair cushion design, our backrest cradles the lumbar area back cushion for office chairto provide long lasting comfort while driving or working. Adjustable, it can be placed behind the upper, middle, or lower back SEAT CUSHION FOR OFFICE CHAIR: We use a "U" shaped ergonomic design to support your lower body while lifting your tailbone, or coccyx, area above hard surfaces. This helps to combat discomfort and fatigue while sitting for extended periods HEAT RESPONSIVE TECHNOLOGY: The office chair cushion comb