Rooftop Tent Fabric Coatings: PU vs Silicone

What a fabric coating is

A rooftop tent listing often names the fabric and then adds a coating word. Canvas, polyester and Oxford are fabric words. PU and silicone are coating words. A coating is a layer applied to the fabric surface to change how it behaves, most often to help it shed water and resist sunlight. The coating is part of the stated details of the listing, alongside the shell type, sleeping capacity and width.

Coating words are seller words: they describe the finish, but they do not carry a score. This site compares tents on stated details, so a coating word is one detail to read, not a verdict. The maker's own pages are the place to read about what the coating is for.

PU coating on a rooftop tent

PU stands for polyurethane. On a listing you may see PU, polyurethane, or a phrase like PU coated fabric. PU is a common coating word on soft shell and hybrid tents, and it sometimes appears next to an Oxford or polyester fabric sentence. A seller may add a figure after the letters PU; that figure is part of the listing and you can read it as a stated detail.

What PU does not promise: it does not promise a measured level of water protection, it does not promise performance in wind or cold, and it does not tell you how the tent handles condensation. Those questions belong to the maker's instructions and care pages. For more on condensation, see the article on condensation prevention.

Silicone coating on a rooftop tent

Silicone is another coating word. It can appear as silicone, siliconized or silicone treated in a listing. Like PU, it is a finish applied to the fabric. The word describes the coating, not the tent's behavior in weather.

What silicone does not promise: it does not change the shell type. A coated fabric can still be part of a soft shell, a hard shell or a hybrid. If you are choosing between shells, read hard shell versus soft shell.

The fabric itself matters as much as the coating. A maker may describe a soft shell as black canvas with an aluminum frame, as Overland Vehicle Systems does on its home page. That sentence names the fabric and the frame, while the coating word stays separate.

Water, sunlight and fabric weight in general terms

The purpose of a coating, in general terms, is to help the fabric shed water and resist sunlight. Those are explanations of what the words are for, not measurements. This article does not measure water resistance, UV stability or fabric weight. A listing can only state its own words, and the maker's pages are the place to read about the fabric.

Thule's home page states that its products are designed for the elements and are pushed in desert heat, arctic cold and UV exposure. Smittybilt's home page describes products developed with off-road use in mind. Those are maker statements about their own gear, not coating ratings. For UV, see the article on UV protection.

On weight: a coating is one part of the fabric construction, and a coating word does not state the weight of the tent. If weight matters to you, compare listings on their stated details; the guides on this site do that reading for you. See the main rooftop tent guide.

What a coating word cannot tell you

A coating word in a title or bullet cannot tell you how a tent behaves in rain, snow or heat, and it cannot tell you how long the fabric will last. It cannot tell you whether a tent is a soft shell or a hard shell, and it does not set the sleeping capacity. Those details come from other words in the listing.

The safe reading: treat coating words as descriptions, not promises. If water behavior matters to you, the maker's instructions and care pages are the place to look. The same rule applies to DWR, which is a different finish; compare it in DWR versus PU coating.

What to ask the maker before buying

The coating word on a listing is only the start. Before you buy, read the maker's own pages and instructions, and write down the questions you want answered.

Mounting and vehicle fit are separate questions. The maker's instructions and the vehicle manual decide them, and a qualified installer can answer them. This article does not give mounting steps.

• What coating is on the fabric of this tent, PU, silicone, or something else?
• What is the coating meant to do for the fabric?
• Is the coating on one side or both sides of the fabric?
• Which part of the tent is coated, the body or the rainfly?
• How should the coated fabric be cleaned and stored?
• Where can I read the maker's care pages for this tent?

What to pick for your situation

Questions

What is PU coating on a rooftop tent?

PU stands for polyurethane. It is a coating word a seller may use to describe the fabric finish. It describes the coating, not a measured level of protection.

What is silicone coating on a rooftop tent?

Silicone is a coating word, sometimes written as siliconized or silicone treated. Like PU, it is a finish applied to the fabric.

Which coating is better, PU or silicone?

This site does not compare coatings by performance. Both are seller words on a listing. If the difference matters to you, ask the maker what the coating is meant to do.

Does the coating make the tent heavier?

A coating is part of the fabric construction, but a coating word does not state a weight. Compare listings on their stated details.

Does a coating make a tent four-season?

No. A coating word describes the fabric finish only. Season words, if the listing has them, are separate stated details.

Where can I read about the coating on a tent?

Start with the listing words, then read the maker's own pages, instructions and care pages before you buy.