From Manufacturer
The X-Large / XX-Large black Steroid Speed Belt V2.0 from Think Tank is a strong 3.5" / 8.9cm wide belt with a curved design that enhances shooting comfort. It is especially designed for excellent back support - a plus when carrying around various components that lock on to the belt. The Steroid is padded with EVA (ethylene vinyl acetate) and contains a durable front buckle with a built-in "stop" to prevent it from slipping. However, if you want to resize the belt, it's quite easy.
The nylon Steroid Speed Belt can be fixed in place to handle any number of optional component pouches that can either "rotate" or be "locked" in position. These components can be moved half way around the belt for your chosen degree of weight distribution. Therefore, if you're standing, kneeling or even prone, you can adjust the position of the accessory pouches so they do not interfere with your shooting. It will also accept Think Tank's optional Pixel Racing Harness that will increase the capacity of what you can tote around. It's backed by Think Tank's lifetime warranty against manufacturer's defects.