Best waterproof outdoor mats for under hot tubs

Start with a PVC drainage roll. A hollow, slatted PVC mat lets splash water fall straight through instead of pooling under the tub, and it stays grippy when soaked — the OVYEOFR 3' x 10' is the best-balanced pick: waterproof, non-slip, and long enough to run along the tub's front where you step out.

Who the others suit:

• Bigger surrounds: the 3' x 16.4' and 3' x 50' PVC rolls cover a whole deck edge in one piece — measure first, since they're sold by the roll.
• Tight budget, small area: the KFFKFF 3' x 10' roll does the same job for very little.
• Soft pad instead of drainage: the 90" x 90" hot tub pads cushion the base but hold water, so they're better on a covered, well-drained slab.

Whatever you choose, lay it over a surface that already drains away from the tub.