Review on High-Quality EnviroCare Replacement Vacuum Filters for Shark Navigator Lift-Away NV350, NV351, NV352, NV355, NV356, NV356E, NV357 - Includes 2 Foam and 2 Felt Filters, Plus 1 Hepa Filter. Perfectly Replaces Shark Part #Xff350 & Xhf350 by Carrie Snethen

Meh. They work I think. I just installed them yesterday. All three filters did not fit. I pushed them in so they could be used. They were just a little big. Felt Filter: Not really felt, more like a dish sponge, a bit longer, but I pushed it in. I doubt a cleaning sponge is as dense as felt. The same goes for the foam filter. The biggest concern was the HEPA filter. I had to hit it. It interferes with the plastic sheet you put on it. The two protrusions at the top don't quite match. Next time I will probably try another brand to fit better.