One size,Please notice,this one only for Neck,not wait belt.

Normal-Features:
1.100% Brand new and high qulity.
2.Magnets help increase blood flow.
3.Relieve lower back pain by reducing pressure.
4.Neoprene back panel for warmth and compression.
5.Vented and breathable elastic side panels.
6.Adjustable and comfortable.
7.Supports along the spine to provide stability for those
   suffering from lower back pain.
8.The strategically placed magnets help with pain relief.
9.Professionally designed Double Pull braces can be adjusted.
to the desired level of both comfort and support using the high
quality fasteners.

Measure around waist and select the proper size

Size                  Suitable Waistline          Maximum stretch length of belt

S                            60-76CM                     101CM

M                           77-86CM                    105CM

L                            87-96CM                    109CM  

XL                         97-113CM                  113CM

Package includes:
1 x Magnetic Back Support Lumbar Brace Belt with 16 magnetic stone in it