Updated:03 November 2026
Rank 1-10 of the best Pool Underlays
Our recommendation Price Customer rating
1. Comparison winner
CosySpa Hot Tub Flooring Protector, Round Foam Mats, 6mm Thick, for Inflatable or Rigid Tubs
CosySpa Hot Tub Flooring Protector, Round Foam Mats, 6mm Thick, for Inflatable or Rigid Tubs
Available immediately
free shipping
  • material EVA foam tiles provide a durable non-slip base for outdoor use
  • thickness options of 6 millimetres or 10 millimetres
  • flexibility interlocking design lets the tiles slot together for quick assembly and easy storage
Our rating
9,8
very good
2. Best value
BIGGAMATS EVA Foam Interlocking Gym Flooring Mat
BIGGAMATS EVA Foam Interlocking Gym Flooring Mat
Available immediately
free shipping
  • made of durable EVA foam
  • thickness of 14 mm provides superior protection
  • flexible interlocking system allows easy fit and removal
Our rating
9,6
very good
Wacredo Pond and Pool Protection Fleece 2x10m
Wacredo Pond and Pool Protection Fleece 2x10m
Available immediately
free shipping
  • made from HDPE plastic fibres and EVA foam
  • available in 300 g/m² and 500 g/m² thickness for various soil types
  • offers flexibility to adapt to different shapes
Our rating
9,5
very good
Generisch Groundsheet 370cm for Pools
Generisch Groundsheet 370cm for Pools
Available immediately
free shipping
  • geotextile material offers protection against punctures and cracks
  • thickness ensures improved durability and stability
  • adapts to different pool sizes for increased flexibility
Our rating
9,5
very good
No reviews yet
5. Bestseller
2 m x 3 m HDPE Pond Liner
2 m x 3 m HDPE Pond Liner
Available immediately
free shipping
  • made from flexible HDPE material for durability and long-term use
  • 0.2mm thick providing a sturdy liner for various applications
  • high flexibility allows for easy folding, bending and contouring to fit pond shape
Our rating
9,4
good
KEAGAN Round Hot Tub Mat 13 ft Diameter Geotextile Ground Protector Non-slip Underlay
KEAGAN Round Hot Tub Mat 13 ft Diameter Geotextile Ground Protector Non-slip Underlay
Available immediately
free shipping
  • flexibility the mat can be cut to fit most pools and hot tubs and can be folded for easy storage
  • application versatility suitable for use around hot tubs bathtubs small pools inflatable pools outdoor barbecues and as car mats treadmill mats grill mats and car repair mats
  • easy installation lay flat under the tub or pool and clean with soap avoid machine washing and the mat can be folded for storage
Our rating
9,4
good
CYH Pond Liner 2M X 2M - Garden Fish Pond Membrane
CYH Pond Liner 2M X 2M - Garden Fish Pond Membrane
Available immediately
free shipping
  • made from durable HDPE material
  • 0.2mm thickness
  • flexible material for easy bending to fit contours
Our rating
9,4
good
Pool Ground Mat 274 × 274 cm (9 × 9 ft), Foldable Waterproof Floor Protector for Inflatable, Frame and Above-Ground Pools, Hot Tubs and Spas
Pool Ground Mat 274 × 274 cm (9 × 9 ft), Foldable Waterproof Floor Protector for Inflatable, Frame and Above-Ground Pools, Hot Tubs and Spas
Available immediately
free shipping
  • thick polyethylene material protects pool bottoms from rocks and rough ground
  • thick construction provides robust protection against sharp stones and rough ground
  • flexible and foldable design allows easy folding and compact storage
Our rating
9,1
good
2.4 x 3.4 m Waterproof Pool Ground Mat for 2 x 3 m Pools
2.4 x 3.4 m Waterproof Pool Ground Mat for 2 x 3 m Pools
Available immediately
free shipping
  • material high density polyethylene (HDPE)
  • flexibility foldable design enables easy folding for storage
  • application versatility suitable as bottom mat for pools and hot tubs and as a cover for pools, cars and other items you want to protect
Our rating
8,9
good
Round Pool Ground Mat - 8ft, 10ft, 12ft, 13ft - Black Outdoor Pool Floor Protector, Eco-friendly Liner Pad
Round Pool Ground Mat - 8ft, 10ft, 12ft, 13ft - Black Outdoor Pool Floor Protector, Eco-friendly Liner Pad
Available immediately
free shipping
  • thickness: 0.5 centimetres (0.2 inches)
  • flexibility: suitable for round or square pool configurations
  • application versatility: versatile use around pools, hot tubs and other outdoor spaces to protect flooring and improve comfort
Our rating
8,9
good

Similar Pool Underlay comparisons

Pool Underlays buying guide: How to choose the right product from the above Pool Underlays test or comparison

What is Pool Underlay and Why We Need It?

Understanding Pool Underlay

Pool underlay refers to a layer of material placed underneath swimming pool liners to enhance the overall performance and durability of the pool structure. It acts as a protective cushion, offering a barrier between the pool base and the liner. We can think of it as a comfortable mattress for your pool, providing essential insulation and safeguarding against damage.

Importance of Pool Underlay

Using pool underlay is crucial for several reasons. It helps to prevent sharp objects, stones, and debris from puncturing your pool liner, extending its lifespan significantly. Moreover, it offers an additional layer of insulation, which can help to retain heat in your pool water, making for a more enjoyable swimming experience. Without it, your pool might suffer from premature wear and tear, resulting in costly repairs and replacements.

The Benefits of Using Pool Underlay for Your Swimming Pool

Enhanced Protection

The primary benefit of pool underlay is the enhanced protection it offers. By placing this additional layer under your pool liner, we reduce the risk of damage from sharp objects beneath the surface. Just like with our everyday items, a little extra cushioning goes a long way in keeping things safe and secure.

Improved Comfort

Having a pool underlay can also improve the overall comfort of your swimming pool. The cushioning effect provides a softer feel underfoot, which can be particularly pleasant when you’re enjoying a long swim or relaxing poolside. It’s like stepping onto a soft carpet rather than a hard floor.

Temperature Regulation

Another benefit worth noting is temperature regulation. Pool underlay can help minimise heat loss, ensuring that your pool remains warm and inviting for a longer period. As we all appreciate the joys of a warm swim, investing in underlay can be a cleverly strategic choice.

How to Choose the Right Pool Underlay for Your Needs

Evaluating Materials

When selecting pool underlay, we have a variety of materials to choose from, including foam, rubber, or geotextile fabrics. Each material has its unique qualities, and we must consider our specific pool conditions. For example, if our pool is situated on a rocky base, we might prefer a thicker foam underlay for higher protection.

Liner Compatibility

It’s essential to ensure that the underlay we choose is compatible with our pool liner. There are specific underlays designed for various types of liners, such as vinyl or fibreglass. Finding the right match is vital to avoid any issues during installation and to ensure optimal performance.

Measuring Your Pool Area

Accurate measurements of our swimming pool area are crucial to selecting the correct amount of underlay. We need to measure both the length and width of the pool, taking into account any additional areas that might need coverage, such as steps or shallow ends.

Installation Tips for Pool Underlay to Ensure Longevity

Preparing the Base

Before laying down the pool underlay, we must ensure that the base is thoroughly cleaned and free of debris. This step is paramount as any hidden stones or sharp objects can compromise the integrity of our new liner.

Laying the Underlay Correctly

When installing the underlay, we want to ensure that it lies flat against the pool base without any wrinkles or folds. Wrinkles can create pressure points that may lead to tears in our pool liner. Instead, we should gently roll it out and ensure it’s secured without any obstructions.

Sealing Edges

Finally, sealing the edges of the underlay where it meets the pool walls can help prevent any shifting or movement due to water weight. We can use adhesive tape or another sealing method recommended for our chosen underlay material. This step helps to ensure that our installation remains solid, even as water is added to the pool.

Maintenance and Care Tips for Your Pool Underlay

Regular Inspections

Maintaining pool underlay begins with regular inspections. We should periodically check for any signs of wear or damage, especially after harsh weather conditions or heavy use. This proactive approach ensures that we can address any issues early on, preventing larger problems down the line.

Cleaning Techniques

When it comes to cleaning our pool underlay, we should take care not to use harsh chemicals that may damage the material. Instead, a mild soap solution and gentle scrubbing will often do the trick. It’s best to allow it to dry thoroughly before covering it with the pool liner again.

Continuous Vigilance

Lastly, remaining vigilant about our pool environment is crucial. Over time, debris or sharp objects can accumulate unnoticed. By maintaining a clean environment around the pool and being attentive to the condition of the underlay, we can optimise its lifespan and maintain a healthy swimming experience.

Table of contents
  1. What is Pool Underlay and Why We Need It?
  2. The Benefits of Using Pool Underlay for Your Swimming Pool
  3. How to Choose the Right Pool Underlay for Your Needs
  4. Installation Tips for Pool Underlay to Ensure Longevity
  5. Maintenance and Care Tips for Your Pool Underlay

Overview

1. Comparison winner
CosySpa Hot Tub Flooring Protector, Round Foam Mats, 6mm Thick, for Inflatable or Rigid Tubs
Our rating
9,8
very good
CosySpa Hot Tub Flooring Protector, Round Foam Mats, 6mm Thick, for Inflatable or Rigid TubsAvailable immediately
2. Best value
BIGGAMATS EVA Foam Interlocking Gym Flooring Mat
Our rating
9,6
very good
BIGGAMATS EVA Foam Interlocking Gym Flooring MatAvailable immediately
Wacredo Pond and Pool Protection Fleece 2x10m
Our rating
9,5
very good
Wacredo Pond and Pool Protection Fleece 2x10mAvailable immediately
Generisch Groundsheet 370cm for Pools
Our rating
9,5
very good
No reviews yet
Generisch Groundsheet 370cm for PoolsAvailable immediately
5. Bestseller
2 m x 3 m HDPE Pond Liner
Our rating
9,4
good
2 m x 3 m HDPE Pond LinerAvailable immediately
KEAGAN Round Hot Tub Mat 13 ft Diameter Geotextile Ground Protector Non-slip Underlay
Our rating
9,4
good
KEAGAN Round Hot Tub Mat 13 ft Diameter Geotextile Ground Protector Non-slip UnderlayAvailable immediately
CYH Pond Liner 2M X 2M - Garden Fish Pond Membrane
Our rating
9,4
good
CYH Pond Liner 2M X 2M - Garden Fish Pond MembraneAvailable immediately
Pool Ground Mat 274 × 274 cm (9 × 9 ft), Foldable Waterproof Floor Protector for Inflatable, Frame and Above-Ground Pools, Hot Tubs and Spas
Our rating
9,1
good
Pool Ground Mat 274 × 274 cm (9 × 9 ft), Foldable Waterproof Floor Protector for Inflatable, Frame and Above-Ground Pools, Hot Tubs and SpasAvailable immediately
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