To find your size do not go by your trouser size. You need to measure around your stomach where the belt will be placed. Sizes: S = 22-27'' (57-69cm) - M = 27-32'' (69-81cm) - L = 32-36'' (81-91cm) - XL = 36-42'' (91-106cm) - XXL = 42-46'' (106-116cm). Wearing this belt will improve posture and help with the treatment of back problems such as - slipped disc, degenerative disc disease, herniated disc, spinal stenosis, and Sciatica. This belt is ideal for all types of lower backaches - The belt can be worn all day while working or playing. The side ventilation panels allow air to circulate and your body to breathe. The double-pull elastic straps provide extra stability and support when tightened which enhances effectiveness of the neoprene and plastic stays. Three flexible plastic stays are positioned to provide extra support to the lumbar area. The adjustable elastic side straps provide extra stability, enhancing the effectiveness of the neoprene material and plastic stays. Provides instant support and stability while still being comfortable and flexible for daily use. The quality neoprene material provides compression and beneficial heat retention.