You'll see "magnetic" in a lot of RV and UTV windshield cover marketing. The word covers everything from external metal-frame clamps to suction cups with embedded magnets to actual patented inside-glass mounting systems. Most aren't what most owners think of when they hear "magnetic."
A real patented inside-glass magnetic cover uses strong neodymium magnets placed against the inside surface of the windshield, paired with magnets sewn into the cover binding on the outside. Magnetic flux passes through the glass to hold the cover in place. No adhesive, no contact with paint, no straps.
Only a few manufacturers can produce this design legally because of patent restrictions. Here's what to look for.
TL;DR
- "Magnetic" is a fuzzy term — covers four different mount approaches with very different reliability
- Inside-glass magnetic is the patented design that doesn't damage paint or trim
- External-frame magnetic clamps to metal trim — works on UTVs, fails on fiberglass RVs
- Suction-with-magnet is a hybrid that mostly relies on suction (and inherits suction problems)
- Real patented designs include a quick-release suction tool for placing/removing magnets
The four mount systems sold as "magnetic"
1. Inside-glass magnetic (patented, premium)
Strong neodymium magnets placed on the inside of the windshield. Cover has matching magnets sewn into the binding. Magnetic flux through the glass holds everything in place.
What works: zero rig contact, 30-second remove, holds in 70+ mph winds, works on tinted glass.
Patent reference: US Patent for inside-glass quick-release magnetic mount system. FIT Protection holds this patent.
2. External-frame magnetic (UTVs only)
Magnets clamp onto a metal trim frame around the windshield. Common on UTVs where the cage and roof line have exposed metal.
What works: OK on UTVs with metal cab framing. Doesn't work: RVs (no exposed metal around fiberglass-framed windshields). Won't hold.
3. Suction with magnet retention
A primary suction cup mount with magnets used as a secondary alignment tool. The suction cup does the heavy lifting; magnets just position the cover.
What works: marketing — sounds like it has the benefits of magnetic. Reality: all the failure modes of suction cups (heat release, tinted-glass problems, pressure marks) plus the magnets are essentially decorative.
4. Inside-cabin magnetic with bungee
Magnets on a strap that goes around the inside of the cabin (over the dashboard, around the A-pillar). Bungee tension holds it; magnets are anchor points.
What works: simpler installation than pure bungee. Doesn't work: still wears the dashboard from bungee tension; not truly "magnetic" by intent.
Why patents matter
Patents on the inside-glass magnetic system restrict who can produce it legally. As of 2026, only a handful of manufacturers in North America hold the rights — FIT Protection is one of them.
What this means for buyers:
- "Magnetic" without a patent reference is usually one of the other 3 mount systems
- "Patented magnetic" with a US patent number is the real inside-glass system
- "Patent pending" is a yellow flag — could be a real new patent or a marketing-only claim
If you're spending $300+ on a "magnetic" cover, ask the manufacturer for the patent number. If they can't provide one, it's not the inside-glass system you're paying for.
What's actually patented
The patent covers three specific innovations:
1. Quick-release suction tool
A specialized suction cup that grips the magnetic backing of the inside-glass magnet. This lets you place magnets exactly where you want them, and remove them without scratching the glass or leaving residue.
2. Rubberized magnetic backing
The inside-glass magnet has a multi-layer rubberized backing that grips the glass via friction (no adhesive) but releases cleanly when pulled with the suction tool. Most generic magnets either slide on the glass (no friction) or use adhesive (residue).
3. Magnet placement system
A geometric arrangement of magnets that achieves balanced hold strength across the cover. Generic magnetic covers often have over-strong magnets in some places and under-strong in others; the patented system distributes hold evenly.
Why these innovations matter for the rig
Each innovation prevents a specific damage mode:
- Quick-release tool prevents glass scratching during install/remove
- Rubberized backing prevents adhesive residue on glass
- Balanced placement prevents pressure points that could affect tint or stress glass
A cover marketed as "magnetic" without these innovations causes one or more of those damage modes. Owners who switched from generic magnetic covers to FIT specifically cite these issues.
How magnetic covers work through tinted glass
Tinted RV windshields use either: - Surface tint — film applied to the inside or outside surface (4-6 mil thick) - Laminated tint — dye in the inner PVB layer of laminated glass
Magnetic flux passes through both types of tint without significant attenuation. The magnetic field strength at the cover-side magnet is the same whether the glass is tinted or clear. We've tested with factory tint, aftermarket tint, and UV-protective laminate; hold strength is consistent.
How magnetic covers work in extreme weather
The magnetic flux is unaffected by:
- Hot weather — neodymium magnets retain 99%+ strength up to 175°F (windshield surface temperature in direct sun rarely exceeds 200°F, and the magnet itself is shielded by the cover)
- Cold weather — magnetic strength is actually slightly higher in cold (within 0.5%)
- Rain and water — water doesn't affect magnetism
- Wind — direct laboratory testing shows hold strength of 6× the lift force at 80 mph wind on a typical Class A windshield
What to ask before you buy a "magnetic" cover
- Is it patented? Ask for the US patent number.
- Where do the magnets attach? Inside-glass = correct. External-frame = wrong for most RVs.
- Is there a quick-release tool included? Real patented systems include one.
- What's the magnetic backing material? Rubberized = good. Adhesive = bad. Bare metal = scratches glass.
- What's the warranty on the magnetic mount? Premium systems offer lifetime warranty on the magnets themselves.
If a manufacturer can't answer all 5 confidently, the "magnetic" cover is probably not the inside-glass system you're paying for.
The future of the patent
Patent protection on inside-glass magnetic mounting expires at varying dates depending on the specific claim. As patents expire, more manufacturers will be able to produce the design legally. We'd expect inside-glass magnetic to become the industry standard within 5-10 years as the patents expire.
For now, it's a small group of manufacturers who can produce this. FIT was one of the first to license the design and remains one of the few US-based manufacturers using it.
See FIT covers by model → Patented Removable Magnets (separate purchase) →
FAQ
Is a magnetic windshield cover better than a strap cover? Yes — for damage prevention, install/remove time, and longevity. Strap covers wear paint and trim at attachment points. Magnetic covers don't touch paint at all. Strap covers take 8-15 minutes to install; magnetic covers take 30-90 seconds.
What patent does FIT Protection use for the magnetic mount? The US patent covers the inside-glass quick-release suction system, the rubberized magnetic backing, and the geometric magnet placement system. Reference numbers are available on request from customer support.
Can I license the patent to make my own covers? Patent licensing is handled directly with the patent holder. Unauthorized reproduction of the patented design would be patent infringement.
Do generic "magnetic" covers without the patent work as well? Usually not. They typically use external-frame clamping (won't work on RVs), suction-cup hybrids (inherits suction failure modes), or basic magnets without the rubberized backing (scratches glass). The patented system specifically addresses each of those issues.
How strong are the magnets? The neodymium magnets used in the patented design produce approximately 30-50 lbs of hold force per pair through a typical RV laminated windshield (1/4" thick). For comparison, that's enough to hold a typical RV cover against 80+ mph wind.
Will the magnets ever fail or weaken? Neodymium magnets retain 99%+ of original strength for 50+ years under normal conditions. The rubberized backing eventually hardens (5-10 years) and can be replaced separately as part of the Patented Removable Magnets product.
