These are the Blue Chip
Gravity Harness Attributes 

Hook Height                       Comfort and Fit                       Suitable for Waves                       Suitable for Freestyle                       Suitable for Freeride                       Suitable for Racing                       Suitable for Speed

Gravity  (Thermoformed 3D - Wave/Freestyle)

Our new Wave/Freestyle hip harness with excellent freedom of movement and maximum comfort. Heavy duty 40mm webbing

Features:

• Fitted with the patented Secure Lock System.
• Maximum Dynamic Support through 3D Shaping, with pre-shaped EVA foam. Dual Density Inner
• Reinforced construction protects the rider from impacts
• Internal batten support
• Integrated primary and secondary Power Belt system: integrated twofold kidney belt with elastic adjustment for perfect fit and preventing slippage
• Optimally placed front and back seams for comfort and protection of the rib area
• Load Equalizer patches
• Strategically placed protectors for a better distribution of power to avoid strain of the lumbar region
• Neoprene-covered positive locking stainless steel spreader bar/hook, high to medium hook positioning, ideal for wave, freestyle and cruising
• Aqua Pro Safety Pack compatible
• Velcro sealed Key pocket  

If you are uncertain of your harness size,  it will probably equate to the approximate size of your wetsuit but this is only a guide.