
A cat litter mat is judged on one thing: how much litter it holds versus how much it hands back to the floor. Most mats catch grains on the way out and release them on the next pass, which is why people conclude mats do not work. The ones that work trap litter in a layer the cat cannot walk it back out of.
Double-layer honeycomb mats. Grains fall through the top holes into a sealed lower chamber and stay there until you open the side and tip them out. Single-layer rubber or EVA mats with raised nubs catch some litter in the grooves but release it as soon as the cat crosses again. Carpet-pile mats hold litter well and are difficult to clean.
Wide enough that the cat takes at least two full steps on it before reaching the floor. One step is not enough — most tracked litter leaves the paw on the second and third stride. Extend it past both sides of the box entrance too, because cats rarely exit straight forward from a high-sided box.
Considerably. Fine-grained clumping clay sticks to paw fur and travels furthest; larger pellets and crystals track less but scatter more when dug. Long-haired cats track far more of any litter than short-haired ones, and trimming the fur between the pads reduces it more than any mat.
Because tracked litter carries whatever was in the box. The CDC notes that the Toxoplasma parasite does not become infectious until 1–5 days after a cat sheds it in its faeces, which is the reason daily scooping and keeping the surrounding area clean matter rather than being merely tidy.
Shake or tip a double-layer mat into the bin weekly and rinse it fully once a month, drying completely before it goes back — damp trapped under a mat grows mould against the floor. Do not vacuum clumping litter with a household vacuum; it absorbs moisture inside the machine and sets solid.

Pair it with a covered litter box to cut both scatter and tracking, or browse Litter Boxes & Scoops.
A high-sided or semi-enclosed box stops litter leaving the tray in the first place, which is a bigger lever than anything at the exit. Filling to one or two inches rather than four reduces how much gets kicked out. Placing the box on hard flooring rather than carpet makes the litter that does escape trivial to sweep.

Some dislike sharp nubs or stiff plastic on their pads. If the cat starts jumping over the mat, switch to a softer surface.
A coarse coir doormat traps litter well but is hard to empty and rough on paws. Honeycomb mats are made for the job.
Weekly. Once the lower chamber fills, grains stop falling through and the mat stops trapping.
Only partly. If the box is near stairs, add a second mat further along the route.
Yes if the cat sprays over the side or misses. A sealed backing keeps urine off the floor underneath.
No. It cuts the area you sweep from the whole room to a metre around the box.
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