MJZ Pool Liner Pad for Rectangular Above-Ground Pools 18 x 9 ft Thickened Felt Underlay — Puncture-Resistant, Thermal Insulation

MJZ 18 x 9 FT Thickened Pool Liner Pad is a seamless, heavy-duty felt underlay designed to protect rectangular above-ground pools from punctures, reduce ground heat transfer, and add a non-slip cushioning layer beneath the liner.

This thickened underlayment from MJZ creates a durable barrier between your pool liner and the ground, improving comfort underfoot and extending the life of the liner. Made from dense, tear-resistant felt with hot-stamped finishing, the pad is pre-cut to fit 18 x 9 ft rectangular pools but can be trimmed for other sizes. It works on common surfaces such as grass, gravel, and wood decking, and installs quickly without adhesives or complex tools.

How does this pad protect my pool liner?

The pad adds a physical buffer that prevents sharp stones, roots and rough ground from puncturing the pool liner. Its thick construction disperses point pressure and reduces friction between the liner and soil, which helps avoid premature wear.

• Thickened felt resists punctures and abrasion to prolong liner life
• Seamless manufacturing lowers weak points along seams
• Hot-stamped finish improves tear resistance under tension
• Suitable for uneven ground—reduces stress on the liner

Will it keep the pool floor cooler on hot days?

Yes — the dense felt offers thermal insulation that slows heat transfer from the ground into the pool. That helps moderate floor temperature and can make water near the bottom feel more comfortable during peak heat.

• Thicker material provides better heat resistance than thin tarps
• Helps stabilize pool-bottom temperature on sun-heated surfaces
• Works as a breathable layer to avoid trapped moisture buildup

Is installation simple for one person?

The MJZ pad is designed for easy, tool-free placement: unroll, position under the pool footprint, and trim where necessary. It’s lightweight enough for one person to handle and adaptable to several common base types without additional fill.

• Pre-cut to 18 x 9 ft for quick placement under rectangular pools
• Can be trimmed with scissors or a utility knife for custom fits
• No adhesives or special fasteners required—just lay flat
• Compatible with grass, gravel, wood decking and compacted soil

How does this pad improve safety and comfort?

The underlayment's texture reduces slipping compared to thin tarps and creates a softer walking surface beneath the liner. That extra cushioning makes standing and moving inside the pool feel more comfortable while providing a more stable base.

• Anti-slip surface reduces liner movement and sliding
• Soft cushioning reduces foot fatigue and improves comfort
• Seamless construction prevents bunching and high spots under the liner

Who is this for: The MJZ 18 x 9 FT Thickened Pool Liner Pad is intended for owners of rectangular above-ground pools who want an affordable, durable underlayment to prevent punctures, improve comfort, and simplify installation. It’s a good fit for do-it-yourself installers preparing a new pool or replacing a worn underpad, and for anyone using common outdoor bases such as grass, gravel, or wooden platforms. If your pool footprint differs, the pad trims easily to size, so it also suits users who need a custom fit for irregular or slightly larger installations.