No Toil manufactures the world's best 2-stage foam air filters. Using only the best flame-laminated dual-layer foam bonded with the highest quality glue they hand-make each foam filter to stand up to the roughest and toughest of any style of riding or terrain. Our Pro-Flo Foam Filter (Standard) filter is what we initially developed. This filter is great for all riding conditions and will provide every rider with the protection needed for worry-free riding.