What type of shoe gator will keep Namibian grass seeds out of your Boots

[kstrain]

I will be hunting Leopard in Namibia in mid July. Mare van Der Merwe, has informed me that the grass seeds and burs are the worst he has seen it for years on his mountain ranch.
Does any member have a boot gator that will fit over the tongue of the boot and keep the grass seeds out?
If so what manufacture, style, country of origin, is the gator from?