Will it work on hardwood floors?

Yes. Natural rubber grips hard surfaces like hardwood, tile and laminate. Avoid using it over wall-to-wall carpet, where a pad with a different backing is the better choice.

Does it add much height under the rug?

No. It is a low-profile pad, so it adds little height and fits under rugs in doorways with tight clearance.

Can I trim it to fit?

The open-weave rubber can be cut with heavy scissors or a utility knife to match an odd-sized rug. Trim slightly inside the rug's edges.

Why does it have holes?

The open grid lets air flow under the rug and makes vacuuming more effective. It also helps moisture escape instead of being trapped.

Is it safe for heated floors?

Natural rubber is generally fine over radiant heat at normal floor temperatures, but check the rug maker's guidance, since some rugs should not sit on rubber.