not if your using the valhalla 360 device. i wear it exclusively while racing...in fact, i won't race without it....but it's not designed for or safe using seat belts....by safe, i mean that in case you have to get out of the kart in a hurry, being strapped to your body and then using seatbelts that are attached to the kart, they could become tangled...whereas a HANS device uses the seat belts to hold it down, so when the belts are released, the device itsn't attached. with the vahalla, you have straps running under your arms and to the front of your device and body...then your laying seatbelts over these strraps, which could become entangled. nuff on that...
seats in a LTO or flat kart need to have a better right side bolster that comes up nearer to the shoulder joint and then a smaller rise up toward the back of the helmet. not all the way up, but enough to be able to lean your head back and feel it. this would in no way compromise safety or the ability to get out of the kart. it would prevent getting the nose of someones kart slammed into your head!! but, too many will elect to go with the "it's unsafe and illegal".... that's easy to say, but as soon as you get nailed in the back of the head, you'll change your tune.....and yes, it will happen...racers. some racers not all, are not considerate of other racers and will do anything to win....including taking you out anyway that they can....i've seen it, read about it and had it happen to me.....deal with it however you want, but getting into any kart with the mind set of "it's not in the rules or illegal and you can't change it" needs to have a serious look in the mirror.....
nuff said...off the soap box...but i still say and will say that seats can be designed safer and more body friendly....all it takes is understanding and innovative thinking...