Wearing under your favourite jacket without feeling bulky
Warming up your upper back to increase core temperature
Soothing stiff back
The Ribbing on the upper edge ensures the perfect fit on the upper back.
The adjustable straps are secured by interlacing with the slit to stay soft and flexible.
The pocket on the right hand side is for holding the battery and cable control
The wider shoulder strap on the left balances the weight of slim battery on the other side.
Minimal construction and seamless knitting enhance wearing comfort.