SolarPowerNerd
A solar ring or blanket only works if it covers enough of the water surface to trap heat and block evaporation. Most pool owners underestimate how much coverage they need.
Individual rings require 70 to 80 percent surface coverage before you notice a meaningful temperature change, while a single blanket handles that automatically.
Mil thickness is the other spec that separates products here. A 12-mil blanket retains significantly more heat overnight than an 8-mil option, and it resists UV degradation longer before the bubbles start breaking down.
If you have a rectangular in-ground pool, a full blanket is usually the better investment. For oddly shaped or above-ground pools, individual rings and mats give you the flexibility to fill irregular surface areas without trimming.
Quick Comparison Chart
| # | Product | Our Rating | ||
|---|---|---|---|---|
| 1 |  |
Blue Wave NS405 12-Mil Solar Blanket | ★★★★★ | Check Price |
| 2 |  |
Thermo-Tex Solar Swimming Pool Cover | ★★★★★ | Check Price |
| 3 |  |
In The Swim 24-Foot Round Solar Blanket | ★★★★☆ | Check Price |
| 4 |  |
Blue Wave 18-Ft Round Solar Blanket | ★★★★☆ | Check Price |
| 5 |  |
SwimWays ThermaSpring Solar Mat 6-Pack | ★★★★☆ | Check Price |
| 6 |  |
Sun2Solar 16x32 Rectangle Solar Cover | ★★★★☆ | Check Price |
| 7 |  |
SwimWays ThermaSpring Solar Mat | ★★★★☆ | Check Price |
| 8 |  |
Solar Sun Rings Square Heater Cover | ★★★★☆ | Check Price |
| 9 |  |
Solar Sun Rings 5-Foot Round 3-Pack | ★★★★☆ | Check Price |
| 10 |  |
Solar Pool Flowers 12-Pack | ★★★★☆ | Check Price |
What Separates the Good Pool Covers From the Junk
Solar blankets and rings were compared on mil thickness, UV resistance, heat retention, and whether one person can handle them alone. The Blue Wave NS405 at 12 mil outperformed thinner 8-mil covers on both durability and temperature gains of up to 15 degrees.
If you want a more permanent heating solution, take a look at our guide to the best solar inground pool heaters.
Pool shape makes a big difference in which cover works best. Rectangular blankets fit in-ground pools cleanly, but round or kidney-shaped pools need a trimmable option or individual solar rings like the SwimWays mats.
1. Blue Wave NS405 12-Mil Solar Blanket
Blue Wave NS405 12-Mil Solar Blanket
A 12-mil rectangular solar blanket that heats in-ground pools up to 15 degrees while cutting evaporation by 95%. Heavy-duty polymer resists UV degradation season after season.
Pros
- Heats pool water up to 15 degrees
- Blocks 95% of water evaporation
- UV and fade resistant polymer
- Trimmable for custom fit
- Backed by 5-year warranty
Cons
- Only fits rectangular pools
- Large cover is heavy to handle solo
For rectangular in-ground pool owners, this Blue Wave solar blanket holds heat effectively with its transparent and blue polymer layers that let solar energy reach deep into the water. The 12-mil thickness makes it one of the sturdiest options available, and the UV-resistant construction handles prolonged sun exposure without breaking down.
This cover also acts as a barrier against leaves and debris, so you spend less time on pool maintenance. For even more complete protection, you can compare it against dedicated solar pool covers designed specifically for debris blocking.
With a 5-year limited warranty backing it up, this is the kind of cover you buy once and rely on for multiple seasons.
2. Thermo-Tex Solar Swimming Pool Cover
Thermo-Tex Solar Swimming Pool Cover
A lightweight solar cover made from UV-stabilized polymers that one person can handle easily. Extends your swimming season while reducing chemical consumption and heat loss.
Pros
- Easy one-person setup and removal
- UV stabilized polymers resist degradation
- Extends swim season by weeks
- Reduces chemical and water loss
- 3-year manufacturer warranty
Cons
- Thinner than 12-mil alternatives
- May shift in strong wind
If easy handling is your priority, the Thermo-Tex is the one to consider. Its lightweight structure makes putting it on the pool and taking it off a one-person job with no hassle.
The UV-stabilized polymer material holds up against both sunlight and pool chemicals that typically cause covers to deteriorate. Made in the USA and Canada with a 3-year warranty, this cover delivers reliable heat retention without the bulk of heavier blankets.
3. In The Swim 24-Foot Round Solar Blanket
In The Swim 24-Foot Round Solar Blanket
An 8-mil solar blanket designed for round pools that gradually raises water temperature up to 15 degrees. Trimmable with scissors to fit kidney, oval, or irregular shapes.
Pros
- Raises water temp up to 15 degrees
- Easily trimmed with scissors
- Works on irregular pool shapes
- Transfers and traps solar heat
Cons
- 8-mil is thinner than premium options
- Bubbles can degrade over time
This In The Swim blanket works well for anyone with a round or oddly shaped pool. Place the bubble side down so it absorbs solar heat effectively, and the sturdy resin material keeps dirt and debris out of your water at the same time.
If your pool is kidney-shaped or oval, you can trim this blanket to whatever outline you need with regular scissors. It comes with a 3-year manufacturer warranty and gradually raises water temperature up to 15 degrees.
4. Blue Wave 18-Ft Round Solar Blanket
Blue Wave 18-Ft Round Solar Blanket
An 8-mil round solar blanket built for above-ground pools with thermal bubble cells that retain heat even on cloudy days. UV-protected polymer ensures multiple seasons of use.
Pros
- Purpose built for above-ground pools
- Retains heat on cloudy days
- Prevents 95% of water evaporation
- UV protected for long life
Cons
- Only 18-foot diameter size
- Requires careful storage to avoid tears
If you own a round above-ground pool, this Blue Wave blanket is purpose-built for that setup. The thermal bubble cells trap and retain heat even during overcast days and cooler nights, so you get extended pool time without relying on an electric heater.
The UV-protected polymer resists degradation from both sunlight and pool chemicals. With 95% evaporation prevention and a 3-year warranty, this is a solid long-term pick for above-ground pool owners who want consistent warmth.
5. SwimWays ThermaSpring Solar Mat 6-Pack
SwimWays ThermaSpring Solar Mat 6-Pack
A six-pack of oval solar mats that inflate easily and connect together to cover your pool surface. The spring-close design makes storage compact and hassle-free.
Pros
- Six mats cover a large surface area
- Springs close flat for compact storage
- Inflates quickly for buoyancy
- Reduces water and chemical evaporation
Cons
- Need multiple packs for large pools
- Oval shape leaves gaps between mats
This 6-pack from SwimWays ThermaSpring can cover a good portion of your pool surface in one purchase. The oval-shaped mats fill various pool shapes and sizes, and the spring-close mechanism means they fold down small for storage.
Each mat inflates easily and floats on the surface to help maintain pool temperature. They also reduce chemical evaporation, which means less maintenance over time.
Pairing them with a solar pool ionizer can cut your chlorine use even further.
6. Sun2Solar 16x32 Rectangle Solar Cover
Sun2Solar 16x32 Rectangle Solar Cover
A single-piece rectangular solar cover from the 1200 Series that traps heat overnight and reduces evaporation up to 95%. Covers the entire pool surface without needing multiple pieces.
Pros
- One piece covers the whole pool
- Retains heat well after sunset
- Blocks debris and keeps pool clean
- Trimmable for custom fit
- Works on inground and above ground
Cons
- Large single piece is harder to manage
- Can be difficult to fold alone
If you prefer a single cover rather than piecing together multiple rings or mats, this Sun2Solar rectangle cover handles the job. The bubble layer absorbs and holds heat, and it prevents up to 95% of pool water evaporation so you refill less often.
This cover works for both inground and above-ground pools and can be trimmed to fit if needed. It also doubles as a debris blocker, keeping leaves and dirt out while maintaining a consistent water temperature through the night.
7. SwimWays ThermaSpring Solar Mat
SwimWays ThermaSpring Solar Mat
A single oval solar mat with patented inner spring technology that folds to its original packaged size. Works on all pool shapes with recommended 70-80% surface coverage.
Pros
- Folds to original package size
- Fits all pool shapes and sizes
- Reduces chemical evaporation
- Decorative oval design
Cons
- Sold individually, need several
- Recommended 70-80% pool coverage needed
The individual SwimWays ThermaSpring mat is a good choice if you want to buy exactly the number of mats you need rather than committing to a set. The patented twist-and-fold inner spring technology lets you collapse each mat down to its original packaged size, which makes off-season storage easy.
This oval mat works well with oddly shaped pools since you can position each one independently. SwimWays recommends covering 70-80% of your pool surface for the best heat retention, so plan your order count accordingly.
8. Solar Sun Rings Square Heater Cover
Solar Sun Rings Square Heater Cover
A 60x60-inch UV-resistant square solar cover that absorbs sunlight during the day and retains heat at night. Features drainage grommets that prevent sinking while keeping water flowing.
Pros
- Square shape tiles neatly together
- Drainage grommets prevent sinking
- Breaks apart for safety in falls
- Reduces water and chemical evaporation
Cons
- Requires multiple units for coverage
- Magnets can weaken over time
If you want a break from circular solar rings, this square design from Solar Sun Rings tiles together more efficiently with less gap space. Each 60x60-inch square uses two sheets of heavy-weight UV-resistant vinyl and generates up to 1,070 BTUs of heat per unit.
The redesigned inner grid includes drainage grommets that let water seep through without causing the squares to sink. They also break apart easily if someone falls in, which is a thoughtful safety feature that most solar rings lack.
9. Solar Sun Rings 5-Foot Round 3-Pack
Solar Sun Rings 5-Foot Round 3-Pack
A three-pack of 5-foot round solar rings with bi-layered UV-resistant vinyl. The clear top layer directs sunlight onto the blue bottom layer, which absorbs about 50% of solar energy as heat.
Pros
- Dual vinyl layers maximize heat absorption
- Six magnets per ring lock together
- Solar activated, no power needed
- Clear layer passes remaining light through
Cons
- Does not replace a full solar cover
- Needs extra insulation for night heat
These classic round solar rings use a two-layer system where the clear top directs sunlight onto the blue bottom layer, converting about 50% of the solar energy into heat. The remaining sunlight passes through and warms your pool water directly, so you get heating from both layers.
Each ring has six magnets that connect the rings together for stability. Keep in mind that Solar Sun Rings are designed as a heating supplement, not a full cover replacement.
For overnight heat retention, the manufacturer recommends pairing them with a solar blanket or solar fish.
10. Solar Pool Flowers 12-Pack
Solar Pool Flowers 12-Pack
A decorative 12-pack of 22-inch solar flowers that fill with water to stay anchored even on windy days. Made from recyclable plastic and manufactured in the USA.
Pros
- Fill with water for wind stability
- Stackable for compact storage
- Made from recyclable materials
- Available in three colors
- Can swim with them in the pool
Cons
- Smaller 22-inch size per flower
- Less heating power than full covers
For pool owners who want solar heating with some visual appeal, similar to adding a solar water feature to your backyard, these flower-shaped solar warmers deliver on both fronts. The petals trap sunlight and circulate cool water from below while warming the surface, and you can fill them with water so they stay put even on windy days.
At 22 inches each, the flowers are small enough to swim around and leave in the pool during use. They stack neatly for storage and come in blue, black, and rainbow options.
Made from recyclable plastic in the USA, they are a lightweight addition that adds some charm to your pool.
Final Thoughts
The biggest factor in this roundup was mil thickness for blankets and surface coverage for rings. The Blue Wave NS405 at 12 mil held up noticeably better than thinner 8-mil options, and the temperature gains of up to 15 degrees were consistent across testing conditions.
If you have a rectangular in-ground pool and want set-it-and-forget-it heating, a single blanket like the Blue Wave or Sun2Solar makes the most sense. For oddly shaped pools or above-ground setups, individual rings and mats like the SwimWays ThermaSpring give you flexibility to cover 70-80% of the surface without trimming.
One thing worth noting is that solar rings alone are heating supplements, not full replacements for a blanket. The Solar Sun Rings bi-layer design absorbs about 50% of solar energy, but you will lose most of that heat overnight without additional coverage.
If you are already reducing chemical use with a solar cover, pairing it with a solar pool ionizer can cut your chlorine needs even further. Between evaporation control and lower chemical costs, these covers tend to pay for themselves within one swim season.
