No Toil manufactures the worlds 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.