ESS ICE Replacement Lens Lens Colour:Smoke Gray What is the difference between

What is the difference between using one filter or two filters at a time

liner is 100% polyester)

hard anodized housing

Holder (actual holder size may vary)

Inner tent pockets Qty: 2

ESS ICE Replacement Lens Lens Colour:Smoke Gray What is the difference betweenESS ICE Replacement Lens ESS Modular Technology allows all lenses to be quickly and inexpensively interchanged. As either single lenses or packs of 50, ICE Eyeshield replacement lenses are available in Clear, Smoke Gray, Hi Def Copper and Hi Def Yellow. Note on Size These lenses are not compatible with the smaller ICE NARO eyeshield. Please double check your eyeshield model before ordering.