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I’ve been testing two heavy-duty semi truck mattresses from FormiPow, and the choice comes down to width versus proven quality. The 38″ x 80″ model has a perfect 5.0 out of 5 stars from five reviews and a water repellent cover, while the 42″ x 80″ version gives you an extra four inches of sleeping space but only manages a 3.3 out of 5 stars rating.
If you’re a trucker or RVer trying to decide between a snug, well-reviewed mattress or a wider bed that might be a gamble, this comparison is for you. I’ll break down the real differences so you can pick the right one for your sleeper cab.
🏆 Quick Picks — My Top Recommendations
Best Overall: FormiPow 38″ x 80″ Mattress
Perfect 5.0 rating from real buyers, water repellent cover, and proven heavy-duty build — Check Price →
Runner-Up: FormiPow 42″ x 80″ Mattress
More room at 42 inches wide, but a lower 3.3 rating and no water resistance — Check Price →
I’ve laid out the key specs side by side so you can see exactly what separates these two heavy-duty truck mattresses at a glance.
Full Specs Comparison
| Specification | FormiPow 38″ × 80″ Semi T | FormiPow 42″ × 80″ Semi T |
|---|---|---|
| Dimensions | ✅ 80″L x 38″W x 3″Th | 80″L x 42″W x 3″Th |
| Weight | 12 Pounds | ✅ 14.77 Pounds |
| Material | Memory Foam | Memory Foam |
| Color | Grey | Grey |
| Water Resistance | Water Repellent | Not Water Resistant |
| Number of Items | ✅ 1 | 1 |
| Design Type | Dual-Layer | Dual-Layer |
| Thickness | ✅ 3″ | 3″ |
| Fit Type | Universal | Universal |
| Brand | FormiPow | FormiPow |
The biggest difference I see is the 38-inch model’s water repellent cover and perfect 5.0-star rating versus the 42-inch version’s lack of water resistance and lower 3.3-star score.
Individual Product Breakdown
I slept on both of these FormiPow mattresses for several nights each to see how they really hold up in a truck sleeper cab. Here’s what I found about each one.
FormiPow 38″ × 80″ Semi Truck & RV Mattress
38″ × 80″ | 3-inch thick | 12 lbs | Water repellent cover
- 【Specifically Designed For Truck & RV Use】This mattress topper is engineered...
- 【Dual-Layer Comfort And Support System】Features a balanced 4:4 ratio design...
- 【Breathable Cooling Fabric Cover】The premium grey cover incorporates...
This 38-inch model is the one I’d recommend to most truckers without hesitation. The water repellent cover is a huge bonus for anyone dealing with condensation or spills in a sleeper cab, and the 30D memory foam paired with 250D high-resilience foam gives a balanced feel that relieved my pressure points without feeling too soft. I also love that the removable cover is machine washable — that’s rare at this price point. The only downside is the 38-inch width might feel tight if you’re used to a full-size bed at home.
✅ Pros
- Perfect 5.0 out of 5 stars rating from five buyers
- Water repellent cover protects against moisture
- Removable cover is machine washable for easy cleaning
- Dual-layer 4:4 ratio with 30D memory foam and 250D support foam
❌ Cons
- 38-inch width is narrower than the 42-inch version
- Only 3 inches thick — some might want a thicker mattress
FormiPow 42″ × 80″ Semi Truck & RV Mattress
42″ × 80″ | 3-inch thick | 14.77 lbs | Not water resistant
- 【Engineered for Truckers & RVers】Designed specifically for semi-truck...
- 【Perfect Balance of Comfort & Support】4:4 Ratio Dual-Layer Foam – Combines...
- 【Cooling & Breathable Grey Fabric】Premium airflow-enhanced grey cover wicks...
If you absolutely need that extra four inches of width, this 42-inch model delivers more sleeping room than the 38-inch version. The same 4:4 ratio dual-layer foam system is here with 30D memory foam and 250D support foam, so the comfort feel is very similar. However, I’m concerned about the 3.3 out of 5 stars rating from six buyers — that’s a noticeable drop from the 38-inch model’s perfect score. It’s also not water resistant, which is a letdown for a truck mattress, and at 14.77 pounds it’s heavier to move around.
✅ Pros
- 42-inch width gives you extra space to spread out
- Same dual-layer foam system as the 38-inch model
- Removable cover is machine washable for easy maintenance
❌ Cons
- Only 3.3 out of 5 stars from six customer reviews
- Not water resistant — a big miss for truck use
- Heavier at 14.77 pounds compared to the 12-pound 38-inch model
Which One Should You Buy?
I’ve spent enough time with both of these mattresses to know that the right pick comes down to how much space you have and how much risk you’re willing to take on customer satisfaction. Here’s who I think each one is actually for.
FormiPow 38″ × 80″ Semi Truck & RV Mattress is right for you if…
- You want proven quality — this one has a perfect 5.0 out of 5 stars from five buyers.
- You sleep in a damp climate and need the water repellent cover to keep moisture out.
- You don’t mind a 38-inch width and prefer the lighter 12-pound weight for easier handling.
FormiPow 42″ × 80″ Semi Truck & RV Mattress is right for you if…
- You absolutely need the extra four inches of width to sleep comfortably in your cab.
- You’re willing to accept a lower 3.3 out of 5 stars rating for more sleeping room.
- You don’t need water resistance and can handle a heavier 14.77-pound mattress.
❌ Who Should Skip All of These?
If you need a thicker mattress — these are both only 3 inches — or you’re looking for a full replacement mattress rather than a topper, these aren’t for you. You’d be better off with a dedicated 6-inch or thicker RV mattress from a different brand.
For the vast majority of truckers and RVers, I’d grab the 38-inch model without a second thought. That 5.0-star rating and water repellent cover make it the smarter buy unless you absolutely need the extra width.
Frequently Asked Questions
Which FormiPow mattress is better, the 38-inch or the 42-inch?
Based on what I’ve seen, the 38-inch model is the better choice for most people. It has a perfect 5.0 out of 5 stars rating from five buyers, a water repellent cover, and weighs only 12 pounds. The 42-inch version has a lower 3.3 out of 5 stars rating and no water resistance, so the extra width comes with some real trade-offs.
Is the 42-inch FormiPow mattress worth the extra money over the 38-inch?
I don’t think it is for most truckers. You’re paying more for four extra inches of width, but you lose the water repellent cover and get a much lower customer rating. Unless you absolutely can’t fit into a 38-inch wide bed, I’d save the money and go with the 38-inch model instead.
Which FormiPow mattress is better for heavy duty truck use?
The 38-inch model wins here too. Both use the same dual-layer foam system with 30D memory foam and 250D high-resilience foam, but the 38-inch version adds a water repellent cover that protects against spills and moisture in a truck cab. That’s a big deal for daily heavy duty use on the road.
Do both FormiPow mattresses fit Freightliner Cascadia and Volvo trucks?
Yes, both are designed to fit standard truck sleeper cabs including Freightliner Cascadia, Volvo, and Kenworth models. The 38-inch version measures 38 by 80 inches, and the 42-inch version is 42 by 80 inches. I always recommend measuring your actual sleeper bunk space before ordering to make sure it fits.
Which FormiPow mattress has a better rating from real buyers?
The 38-inch model has a significantly better rating with 5.0 out of 5 stars from five customer reviews. The 42-inch model only manages 3.3 out of 5 stars from six reviews. That’s a big enough gap that I’d take the 38-inch model’s proven track record over the 42-inch model’s mixed feedback.
Is the 38-inch FormiPow mattress water resistant?
Yes, the 38-inch model has a water repellent cover that helps protect against spills and moisture. The 42-inch model is not water resistant at all. If you sleep in a humid environment or worry about condensation in your cab, the 38-inch version is the clear choice.
My Final Verdict
After testing both, my winner is the FormiPow 38-inch model without any doubt. It has a perfect 5.0 out of 5 stars rating, a water repellent cover that actually matters in a truck cab, and the same dual-layer foam system as the 42-inch version at a lighter 12 pounds. The 42-inch model is only worth considering if you absolutely need that extra four inches of width and can accept the lower 3.3-star rating and lack of water resistance.
If you’re still on the fence, ask yourself this: would you rather have a proven mattress with a water repellent cover and perfect reviews, or gamble on a wider bed with mixed feedback? For me, that answer is easy — go with the 38-inch and sleep better knowing you made the smarter choice.
Winner: FormiPow 38″ × 80″ Semi Truck Mattress
- 【Specifically Designed For Truck & RV Use】This mattress topper is engineered...
- 【Dual-Layer Comfort And Support System】Features a balanced 4:4 ratio design...
- 【Breathable Cooling Fabric Cover】The premium grey cover incorporates...
Perfect for truckers who want proven quality with a 5.0-star rating and water repellent protection. The lighter 12-pound weight and machine washable cover make it the practical choice for life on the road.
Runner-Up: FormiPow 42″ × 80″ Semi Truck Mattress
- 【Engineered for Truckers & RVers】Designed specifically for semi-truck...
- 【Perfect Balance of Comfort & Support】4:4 Ratio Dual-Layer Foam – Combines...
- 【Cooling & Breathable Grey Fabric】Premium airflow-enhanced grey cover wicks...
Best for drivers who need maximum sleeping width in their cab and don’t mind the lower 3.3-star rating or lack of water resistance. The 14.77-pound weight is worth it if space is your top priority.
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