J4 Sport

Warmup Sport

  • Anatomically designed to conform to your lower back
  • Adaptive lumbar support equipped with stabilizing support straps for ultimate comfort
  • Removable rigid lumbar support
  • Dual stage adjustment to customize fit for targeted direct heat
  • Supreme Carbon Fiber Heating Technology –will immediately assist in relieving muscle tension, pain & stiffness


7.4v 5000 mAh Rechargeable Lithium Ion

Low/5 hrs

Med/3chrs

High/2 hrs

Regards,