Function: 

1) Provides support and compression for sufferers of lower back pain 

2) Helps to facilitate good posture by preventing a slouched position 

3) Reduces the strain on the lower back muscles, ligaments and discs 

4) Adjust support level using high quality velcro fasteners 

5) Removable self- heating pad offer the waist permanent warmth.

Size:

M: 20"-28" 

L: 23"- 31"

XL: 30" - 37"

XXL: 37" - 44"

Tips:

1) the pad will not heating immediately when you wear it. you need to wipe the Tourmaline pad with a wet towel and wait about 10 minutes to feel warmth.

2) It's better to wear thin clothing under the heating pad.