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You are here: Home > Learning Center > Everything You Need to Know About Hot Tub Covers
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Functions and Benefits of a Hot Tub Cover:

  • Hot tub covers keep foreign objects like leaves, dust, other organics, or even animals out of the hot tub water.
  • Hot tub covers reduce maintenance by keeping out contaminants. Water chemistry can change quickly and drastically if there is no hot tub cover to protect the hot tub.
  • Hot tub covers keep your electric bill down by allowing the spa heater to run more efficiently and insulating properly, especially in colder conditions.
  • Hot tub covers increase safety around the hot tub. The cover can keep children and pets from falling into the water when you are not around. Spa covers made by HotTubThings come with ASTM approved locks and tie downs to ensure the safety of your pets and loved ones.


HotTubThings covers meet and exceed ASTM (American Society for Testing and Materials) safety standards for all sizes, densities, and models of spa covers! Spa cover safety is very important, especially if you have children or pets around your spa. Our spa covers received UL classification, and our spa covers are the only ones classified for ASTM Safety on all sizes, densities, and models. You can feel confident that we will build a hot tub cover that is favored by safety code officials across the nation. The ASTM even has standards that include a category intended to protect children five years old and under, and all our hot tub covers meet this requirement. We are committed to providing you with the safest spa cover for your hot tub, but more importantly for your safety and the safety of those around you.

*Please note: many municipal building codes require ASTM compliant hot tub covers, so you can’t go wrong ordering from us!

Main Features of a Hot Tub Cover:

Marine Grade Vinyl

All HotTubThings covers are made with marine grade vinyl. This vinyl is mildew and UV resistant because it is treated with inhibitors during the production process. The vinyl has an ability to stretch and shrink with the foam core, allowing the cover to be stronger at stress points. The vinyl has a -20° F cold crack rating and has been tested to withstand 1500 UV hours. It is also oil stain, fungus stain, sulfide stain, and salt water stain resistant. The durable material can easily be cleaned with a non-abrasive soap and water.

To keep the hot tub cover vinyl looking like new, it is necessary to treat the vinyl with a special vinyl protectant, such as 303 Aerospace Protectant or Leisure Time Cover Care & Conditioner.

Virgin Foam Core

HotTubThings uses virgin foam cores made of polystyrene inside all hot tub covers. Because these foam cores are not ground down to your specified size during production, they are much stronger and durable than most other covers.

Spa cover skirt

Our skirts are double stitched into the spa cover for strength and gusseted to provide the best protection. It is custom cut to help seal the spa heat in, keep dirt out, and protect your acrylic from UV. Extreme heat can build up between the skirt and the outer lip of the spa when the sun beats down on the hot tub cover, and this can damage the outer lip of the spa. Our hot tub cover skirt will allow this heat to escape, preventing any heat damage.

Heat Seal Gasket

All hot tub covers come with the option of adding a heat seal gasket that prevents heat loss at the fold of the cover. The fold of the cover usually creates a small gap where heat can escape, and the heat seal gasket seals this area in when the cover is closed to maximize heat retention. The return on investing in the heat seal gasket as part of your cover package is usually seen in less than 12 months, according to independent testing.

Double Wrapped Core

All hot tub covers come with the option of adding a double wrapped core that offers moisture protection for the virgin foam core. If you are someone who has dealt with a waterlogged cover or issues with the foam in the past, this option is definitely worth the money.


The taper of a hot tub cover is the difference between the thickness of the foam at the fold of the cover and the thickness of the foam at the edges of the cover. The taper will always be enough to let water run off, but still thick enough for superior heat retention. Larger tapers will provide more heat retention, or what we call a higher R-value. This is because a larger taper means that the foam is thicker all over.


R-Values are a rating of the quality of the cover. Generally, the best covers will insulate the hot tub the best. The higher the R-Value, the better the heat retention and insulation of that cover. R-Values are calculated based on the density of the foam, and the foam taper chosen. Here is a list of the R-Values based on various combinations we offer at HotTubThings:
  • 1 lb foam with a 4”-2.5” taper has an R-Value of 12
  • 1.5 lb foam with a 4”-2.5” taper has an R-Value of 14.5
  • 2 lb foam with a 4”-2.5” taper has an R-Value of 16
  • 1.5 lb foam with a 5”-3” taper has an R-Value of 20
  • 2 lb foam with a 5”-4” taper has an R-Value of 30+


Everyone has different style preferences, so HotTubThings has provided 11 different color options for the hot tub cover vinyl. With this many choices, everyone is bound to find a color they like.

Other Important Features

Double-ply poly-laminate

Spa covers can be just as vulnerable from the inside as the outside. This is why our eleven-ounce double laminate vinyl with polyester with reinforcing scrim keeps chemical fumes and moisture from invading our spa covers. It is mildew resistant, with -40 degree cold crack. This material is extremely tough, so we use it throughout the entire spa cover for some extra reinforcement.

Tough ‘n’ sturdy 4-layer hinge

Our hinge has 4 layers of vinyl to add extra strength to this critical stress point of hot tub covers. This hinge was tested with an automatic arm, and the hot tub cover was lifted on and off thousands of times with no discernable wear to the hinge.

Extremely strong handles

Most spa covers will come with weak black web mesh handles. Every one of our spa covers comes with handles that engineered to be super strong and long lasting. Not to mention, the handles have foam padding inside that provide greater comfort when lifting. Our hot tub cover handles are made of nylon webbing that adds to the strength of the handle. They are integrated into the hot tub cover with additional stitching and internal reinforcing making them one of the strongest handles available in the industry.

Plastic drain grommet

The low profile drain grommets help release any moisture that gets trapped and accumulated between the vinyl and the foam core. These drain grommets are made of industrial grade nylon and are located on the underside of your hot tub cover. The grommets will not corrode, nor will they scratch your spa.

Commercial grade zipper

The nylon zipper is hidden away in its own pocket. This protects the zipper from corrosion, yet still allows for easy access to the sealed core. It also adds to the overall appearance of the spa cover, and creates a more attractive finished look.

Center release spa cover fasteners

Center release spa cover fasteners are sturdier than the standard surelock fasteners. They hold up better in cold climates, and are very easy to use. The fastener opens with the simple push of a button, which makes this type of fastener especially good for anyone with strength or dexterity limitations. This type of fastener even locks for safety.

Energy efficiency

We manufacture our hot tub covers thinking green, which in turn will save you green. The insulation value derived from our manufacturing process using virgin foam cores, 27 ounce marine grade vinyl, full length heat seal gaskets as well as the unmatched tightness of the vapor seal to the hot tub are some of the important construction details in terms of overall energy efficiency. The California Energy Commission (CEC) was the first governing body to mandate a standard of hot tub efficiency compliance. Our spa covers rate one of the highest R-Values in the industry, and we were effortlessly able to pass the CEC’s strict guidelines.
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