Trimmed perfectly to fit our cabinet.  Score it on the "top side" with an exacto knife, then flip it over and bend gently from one end working your way down... about 5 inches into the "gentle bending" the whole edge will snap right off.  Took me 20 mins max to do this - the real pain is putting all the stuff back in under your skink ;)  Well worth it to protect from leaks though!  Sturdy neutral color that blends right into our cabinetry,  I keep a ton of stainless steel and glass cleaners/fire extinguisher/detergent/etc under the sink and did not notice any troubles getting stuff to balance on the grooves.