I have about 3,000 liner feet in of exterior grade poly foam that keeps gutters from clogging. It is in 4 foot lenghts and is cut for 5" k style gutters. I have used it in my own guters since late March 2004. It works great in spring, summer, fall , and winter. I bought a truck load of it to sell from the foam manufacturer after I quit Gutter Filter when they raised their prices. Its the same ploy foam with UV protection and biocide built in to it. It is cut slightly different on the interior cut to make it better. I am closing out on this stuff, as I have other business interests demanding more of my time. I wil sell it $2.00 +.50 shipping per liner foot anywhere in the continental US. e-mail me nocloggutters@yahoo.com or call 1-800-650-9733 (answers as Town & Country). Ask or leave a message for Jim.