Drydiet 63 x 40 in Heavy Duty Rubber Cold Plunge Tub Floor Mat, Ice Bath Tub Mat

A tub full of 50 °F (10 °C) water sweats in damp air the way a cold glass does, and the sweat runs down the wall and pools under the tub. This Drydiet mat is a black oval of rubber-backed matting, 63 × 40 in (160 × 102 cm), made for exactly that spot: the listing names condensation under cold plunge tubs and moisture on wood, tile and outdoor floors as the things it is there to stop. Two stitched outlines on the face show where a round or an oval tub goes, and the rest is a dry strip to step out onto.

It is flat, so water that lands on it stays on it until it is wiped, and the listing gives no thickness. The surface is described as both rubber and water-absorbent, which reads as a fabric face on a rubber back. Lay it before the tub is filled: a full one-person tub is several hundred pounds, and nobody lifts it to slide a mat underneath.

Tip: Put the tub on the round outline at one end and leave the long end toward the door, so the step-out strip is where your first wet foot lands.