This razor-sharp Henckels knife block set has every knife you need to chop, slice, peel, and more. Shop it now for 57% off at Amazon.

Instead, you can just sharpen them. We found a pocket knife sharpener on sale that one reviewer says changed their blades from “butter knife dull” to “razor sharp” after one use ...

and eight 4.5-inch steak knives, along with kitchen shears and a self-sharpening block that doubles as storage. One customer said the blades cut through meat and frozen veggies like butter ...

Make enough attempts to cut foam using whatever you’ve got — utility knife, hacksaw, serrated plastic knife — and you’ll wish hard for something that cuts cleaner, faster, and better.