Plastic vs. Aluminum Lower Doors for Your UTV — Which Should You Buy?

If you're shopping for lower door protection for your UTV, you've already figured out the first step: you need them. Trail debris, rocks, mud — open doors are a liability on serious terrain. But which material should you go with? Plastic and aluminum doors are both popular, and both are genuinely good choices. The right one depends entirely on how and where you ride.

We sell both materials here at 4x4ModSource, so this isn't a pitch for one over the other. Here's an honest breakdown of what each does well and where each falls short.

Plastic (Polypropylene) Lower Doors

What They Are

Polypropylene (PP) door inserts are injection-molded panels designed to bolt directly to your factory door frame. They're the same general material used across automotive interior trim panels worldwide — light, impact-resistant, and UV-stable when properly formulated.

Pros

• Lower upfront cost — typically 20–30% less than equivalent aluminum doors
• Lighter weight — less impact on suspension tune and payload capacity
• Flex on impact, then return to shape — won't dent from a brush or light rock hit
• UV-stabilized polypropylene won't fade or crack under desert sun
• Easier to trim or modify if your rig has aftermarket lower frame additions
• Color-matched black finish looks factory from the factory

Cons

• Won't withstand a hard direct impact from a large rock or tree stump
• Can crack on a truly severe strike — aluminum will dent instead of crack
• Slightly less premium feel when touched — aluminum sounds and feels more solid

Best For

Trail riders who ride moderate desert terrain, duners who want cockpit protection without adding weight, or riders on a budget who need quality protection without breaking the bank. Plastic inserts are also the smart choice if you frequently swap doors on and off.

Aluminum Lower Doors

What They Are

Aluminum lower doors are formed from sheet aluminum (typically 3003 or 5052 alloy) and finished with a black powder coat. They bolt to the same factory mounting points as plastic inserts — same install process, higher material grade.

Pros

• Significantly more durable against direct rock, stump, and obstacle strikes
• Dents instead of cracking — a dented door still protects you
• Premium look and feel — substantial weight and sharp finish
• Better resale value for the machine — looks like a proper build
• Holds up better over many seasons without UV degradation or warping
• Powder coat is more scratch-resistant than unpainted plastic

Cons

• Higher cost — typically 25–35% more than equivalent plastic inserts
• Heavier — adds a few pounds per door, which matters to some riders
• Will dent on hard strikes — dents are permanent without metalwork
• Harder to trim or modify if you have unique frame additions

Best For

Technical rock crawlers, riders who push into tight brush and trees, any build where you want the machine to look as serious as it is, or anyone who plans to keep and ride the machine hard for years. Aluminum is also the right call if you're building for resale — it photographs and presents much better than plastic.

Weight Comparison

For a 2-door set, plastic inserts typically weigh 4–6 lbs total. Aluminum doors run 8–12 lbs for the same two-door set. On a 1,200 lb RZR XP 1000, that 6 lb difference is negligible for most riders. If you're building for racing or chasing lap times at a track, every pound matters — use plastic. For trail riding, don't overthink the weight difference.

Price Comparison

At 4x4ModSource, the plastic RZR XP 1000 door inserts run $151.99 for a 2-door set. The equivalent aluminum lower doors are $142.49 — actually lower in this case because of current pricing on our aluminum product. Pricing varies by product, so always check the actual listing. As a general rule across the broader market, aluminum commands a slight premium.

Our Recommendation

Still not sure? Text our team at 480-322-4626. Tell us where you ride and what you're looking for, and we'll point you in the right direction in about two minutes.