While a hair rig consisting of a hook and a knotless knot alone has caught countless fish and will continue to do so, a simple way to increase your hook up ratio is to add some silicone tube. There are a few different ways to do this but the general idea is the same, some on the shank for the hook and some over the eye of the hook.
So there you have it, a basic hair rig tied up with tubing. Not hard to do and will certainly help to get you more hook ups.
For a video on trying a hair rig click here.