Deluxe SC777 Magnetic Bubble Car Seat Cushion For Lower/Middle/Upper Back Comfort -Massage Therapy-1pc Padded Cover (Black) Strategically placed magnets help to relieve stress points in the shoulder, back, seat and legs Soft molded foam bubbles stimulate circulation and improve posture Reduces lower/middle/upper back tension, aches and pains Easily attaches to most chairs and car seats with an elastic strap to wrap around Exclusive From DLUX TM Features Lightweight and washable surface