Heavy-duty 30oz marine-grade vinyl is the most common all-weather choice — it's durable, waterproof, UV-resistant, and holds up against snow, rain, and sun while staying flexible enough to install yourself. Plywood/foam board is more budget-friendly but less portable; canvas is lighter but needs water-resistant treatment.

The vinyl alone works as a wind and weather barrier, reducing heat loss and keeping pests and debris out. If you're in a cold climate or living in the rig full-time through winter, adding foam board or insulation panels behind the vinyl improves heat retention further.

Snaps, turn buttons, or hook-and-loop Velcro are the most common fasteners — Velcro is easiest if you want to take the skirting down seasonally, while snaps/grommets give a tighter, more permanent seal.

Yes — in summer it blocks hot air and direct sun from the undercarriage, which takes some of the load off your AC system, in addition to its winter role of blocking cold air and reducing frozen pipes.

Measure from the ground to the bottom edge of your RV at multiple points around the rig, since the ground usually isn't perfectly level — you'll need those variations to cut panels that seal properly all the way around.

Rinse with water and mild soap every few weeks to remove dirt. Before storing for the season, make sure the material is completely dry before rolling it up to avoid mold or mildew.

Yes — sealing the undercarriage is one of the main secondary benefits, since open undercarriages are a common entry point for dust, debris, and small animals.