GRIN HEALTH HIGH-DENSITY MEMORY FOAM ORTHO CUSHION - U for coccyx, tailbone, back or hip pain and sciatica relief - ..............We offer 3 different firmness available soft, medium and extra firm and options to choose standard, medium or large size..............Its removable and washable BREATHABLE MESH COVER, equipped with an ANTI-SLIP BOTTOM, has a convenient CARRYING BAG...........GRIN HEALTH SEAT HELPS : Coccyx, sciatica, tailbone relief More relaxed, and with less lower back stress Distributes body weight to make sitting more comfortable Extra cushioning.............IMPORTANT TIPS ? First, know that using for the 1st time can cause temporary discomfort/uncomfortableness, your body may need time to adjust and relax into the new posture that your grin health support provides. ? Many users experience immediate relief, and some require several weeks of regular use.............ATTENTION ? Grin Health cushion will not cure your back pain, but it will relieve the pressures and strains caused by sitting that aggravate your underlying condition so you can be comfortable.