Yes, Sand Mine outdoor rugs can be left out in the rain — polypropylene doesn't absorb water, so rain sits on the surface rather than soaking into the weave. The 9x18 and 6x9 Lattice carry a full waterproof designation; most other sizes in the Sand Mine line are rated water-resistant.
Sand Mine outdoor rugs use a flatweave polypropylene construction with gaps in the weave that let water drain through rather than pool on top. After a rain, the surface dries quickly because there's no absorbent pile to hold moisture. The distinction between water-resistant and waterproof matters within the Sand Mine catalog — the water-resistant sizes repel surface moisture effectively but the waterproof-rated sizes handle sustained wet conditions without any seepage risk.
- Sand Mine 9x18 and 6x9 Lattice carry a waterproof rating; remaining sizes are water-resistant.
- Sand Mine outdoor rugs are made from 100% virgin polypropylene, which does not absorb water.
- Flatweave construction allows water to pass through the weave rather than pooling on the rug surface.
- Sand Mine outdoor rugs are safe for use on living grass due to the open, breathable weave structure.