Crucial Vacuum Shark Navigator Lift-Away Filter Kit 1 Foam Filter and 1 Felt Pre-Filter Washable Foam and Felt Pre-Filter Replacement Kit by Crucial Vacuum Fits the following Shark Navigator Lift-Away Models: NV350, NV351, NV352, NV355, NV356, NV356E, NV357 Replaces Shark Part# XFF350 Absolutely Essential for Allergy Sufferers; Traps 99.97 of airborne particles Designed & Engineered in the USA by Crucial Vacuum