Ergo21 Liquicell Bicycle Cushion - Better Than Gel (Foam & Air) LiquiCell improves blood flow and circulation by 150% An aid for buttock pain, hip pain, groin pain, leg pain, sciatica Reduce fatigue, numbness & tail burn Draw string holds cushion in place - just slip it on top of your regular or exercise bike Custom made foam absorbs road vibrations for a smoother ride