FOR REFERENCE :
Inflatable Air cushions are considered high risk, are great for straight long distance travelling but are prone to puncture (they can get snagged on buckles, studs etc) and aren’t as long wearing as gel.
Gel cushions are considered medium risk, are great for winding roads, are long life, require no maintenance & good for travelling shorter distances but hold the heat so aren’t fabulous in hot weather.
Air mesh cushions are considered low risk, good for simple numb bum or medical issues (coccyx sensitivity/cancer etc), great in the rain and heat.
Size is also important if you have any additional problems with your legs or back (go bigger!).
Last note of warning, not all gels are equal. Since our success we have seen a great many “gels” come on the market, lots that cannot hold the body weight, lots that aren’t anti fungal, anti bacterial or fire retardant so if you opt for gel – choose wisely.